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  • Research article
  • Open Access
  • Open Peer Review

Efficacy and safety of pharmacological treatments for Lyme neuroborreliosis in children: a systematic review

  • 1, 2Email author,
  • 2,
  • 1, 3,
  • 4,
  • 5,
  • 2 and
  • 1, 6
BMC NeurologyBMC series – open, inclusive and trusted201616:189

https://doi.org/10.1186/s12883-016-0708-y

©  The Author(s). 2016

  • Received: 13 February 2016
  • Accepted: 20 September 2016
  • Published:
Open Peer Review reports

Abstract

Background

Many aspects of pharmacological treatment of Lyme neuroborreliosis in children, such as choice of drug, dosage, and duration are subject to intense debates, leading to uncertainties in patients’ parents and healthcare providers alike. To assess the available evidence for pharmacological treatment for children with Lyme neuroborreliosis we conducted a systematic review.

Methods

The comprehensive systematic literature search included randomized-controlled trials (RCTs) and non-randomized studies (NRS) on treatment of Lyme neuroborreliosis in children (age <18 years). Our primary outcome was neurological symptoms after treatment. Risk of bias was assessed with the Cochrane risk of bias tools for RCTs and NRS. Quality of evidence was assessed using the Grading of Recommendations Assessment, Development and Evaluation (GRADE) approach.

Results

Two RCTs and four NRS were eligible for inclusion. Risk of bias in RCTs and NRS was generally high. Reporting of studies was generally poor. Regarding the primary outcome neurological symptoms at 1–3 months, no statistically significant difference could be found in cohort studies between doxycycline and beta-lactam antibiotics. In two RCTs comparing penicillin G and ceftriaxone, no patient experienced residual neurological symptoms at the last reported time points. Quality of evidence according to GRADE was judged very low.

Conclusions

Data is scarce and with limited quality. Several issues could not be addressed due to scarcity of information. No eligible study compared different treatment durations. According to the available evidence, there seems to be no difference between different antibiotic agents for the treatment of Lyme neuroborreliosis in children regarding neurological symptoms. We found no evidence that supports extended antibiotic regimes.

Review registration

Systematic review registration: CRD42014008839.

Keywords

  • Ceftriaxone
  • Neurological Symptom
  • Doxycycline
  • Case Definition
  • Wide Confidence Interval

Background

Lyme borreliosis is a tick-borne infectious disease affecting several organ systems including the nervous system caused by Borrelia burgdorferi sensu lato. It occurs with an incidence of about 111/100,000 inhabitants in Central Europe, of which approximately 2–3 % will develop neurological manifestations [1, 2], based on the large population-based study from central Germany. A bimodal pattern with two age peaks can be observed, one in children aged 5–14 years and one in elderly people aged 65–74 years [2, 3]. By far the most frequent early manifestation of Lyme borreliosis is erythema migrans, although other manifestations of the disease can occur without dermal signs [4].

Common clinical manifestations of Lyme neuroborreliosis in children are cranial nerve palsy and meningitis [3, 5]. Late manifestations, like myelitis or encephalitis, are rarely seen in children [6]. Diagnosis is usually based on clinical presentation, serologic testing and analysis of cerebrospinal fluid [4].

The likelihood of a diagnosis of Lyme neuroborreliosis in adult patients can be evaluated by case definitions regarding the available diagnostic results [7, 8]. According to results of diagnostic tests, likelihood of diagnosis can be rated as ‘possible’, ‘probable’ or ‘definite’ as proposed by the European Federation of Neurological Societies [8, 9]. Unfortunately, no validated case definitions exist for children. The qualification as a ‘possible’ case requires only the detection of antibodies against Borrelia burgdorferi in serum, which is reported to occur in approximately 5 % of otherwise healthy children in endemic areas [10]. The case definition of a ‘probable’ Lyme neuroborreliosis requires a confirmed lymphocytic pleocytosis in the CSF analysis with no other plausible explanation. The case definition of a ‘definite’ Lyme neuroborreliosis is determined by the presence of specific intrathecal antibodies against Borrelia burgdorferi additional to a conformed lymphocytic pleocytosis in CSF analysis. In early stages of Lyme neuroborreliosis in children, an intrathecal synthesis of antibodies against Borrelia burgdorferi in CSF may be absent [11]. If untreated, acute symptoms may vanish in some cases, but some children with Lyme neuroborreliosis may develop late manifestations of the musculoskeletal or nervous systems [12, 13].

Residual symptoms and long term outcomes after treatment are subjects to debate, as some studies report cognitive deficits in children with Lyme neuroborreliosis [14], whereas other studies report normal findings in neuropsychological tests for children with Lyme neuroborreliosis after antibiotic treatment [15].

Choice of drug, route of administration, and duration of treatment are still a matter of debate [16, 17]. Treatments with multiple antibiotic drugs concomitantly, antibiotic agents like carbapenems and adjuvant drugs like hydroxychloroquine and extended antibiotic treatments >28 days are recommended by guidelines from patient advocacy groups [17]. Extended antibiotic treatments may cause considerable harm, even fatal complications have been reported [18, 19]. Furthermore, unnecessary extended antibiotic courses contribute to the growing problem of multidrug-resistant bacteria [20].

Guidelines from scientific societies recommend treatment for 14–28 days [7, 16, 21]. Recommendations for such treatments should be based on solid clinical evidence. We assessed the available evidence for pharmacological treatments for children with Lyme neuroborreliosis.

Methods

We searched the databases MEDLINE (via Ovid, from 1950 to 2015), EMBASE (via Scopus, from 1980 to the present) and the Cochrane Central Register of Controlled Trials for eligible studies. Search strategies are shown in Additional file 1. No language restrictions were set. In addition, we searched three trials registers (www.controlled-trials.com, www.clinicaltrials.gov and www.who.int/trialsearch/) to identify further published or unpublished studies or data for completed or ongoing studies.

We included randomized controlled trials (RCTs) and non-randomized studies (NRSs) evaluating pharmacological treatment of children (age <18 years) with clinically diagnosed Lyme neuroborreliosis. Studies were eligible for inclusion if they reported a comparison of a pharmacological treatment against another pharmacological treatment, against placebo or against no treatment. Studies without a comparison group or a population of less than five patients were excluded.

Diagnosis of Lyme neuroborreliosis was based on the clinical case definition by Halperin, Kaiser and Mygland [7–9]. Diagnostic criteria for case definitions were described in detail in a protocol for a systematic review on pharmacological treatment of Lyme neuroborreliosis in adults [22]. We applied the same methods in this systematic review regarding pharmacological treatment in children. Studies regarding patients with ‘Post-Lyme-Disease’, defined as previously treated patients with persistent symptoms in the absence of evidence for ongoing infection, were excluded. Any pharmacological treatment, including combinations of treatments, was considered. Single agents as well as groups of antibiotics were compared with each other.

Our primary outcome was ‘neurological symptoms after treatment’. If several time points were reported in a primary study, data from the last time point was considered. If data permitted, results were presented for short term follow-up (1 to 4 months following the start of treatment) and for long term follow-up (last reported time point). Secondary outcomes were adverse events, disability, patient reported outcomes (e.g., quality of life, pain, fatigue, depression, cognition and sleep), and cerebrospinal fluid pleocytosis. Any adverse event as defined and reported by the original authors was considered. Adverse events were reported as serious adverse events when they required hospitalization, were life-threatening, fatal or when reported as serious adverse events by the original authors.

Firstly, one reviewer (RD) evaluated titles and abstracts to determine whether the study was possibly eligible. Secondly, each full text was evaluated independently by two reviewers (RD, SS or TH) for eligibility. Disagreements were resolved by discussion or with a third reviewer (JM). Two review authors independently extracted data from the full texts of included studies using a specifically developed extraction form, which had been piloted previously. Data was entered into Review Manager (RevMan 5.3) by one of the reviewers and checked by a second reviewer. Discrepancies in data extraction or entry were resolved by discussion with a third reviewer. Reviewers were not blinded to study author, journal, or institution. Risk of bias was assessed by two reviewers independently using the Cochrane risk of bias (RoB) tools for RCTs and for NRSs, respectively [23, 24]. According to the recommendations for the Cochrane RoB-tool for NRSs, no studies assessed as having a ‘critical’ risk of bias were included in the quantitative data synthesis. We initially planned to assess the primary outcome ‘neurological symptoms’ as a continuous outcome. However, the majority of included studies reported the outcome dichotomized, so the results are presented accordingly. If neurological symptoms were reported as continuous or categorical variables, data was appropriately dichotomized according to the measurement scales and categories used. Data was analyzed on an intention-to-treat basis. If this was not possible, data was used as reported by the primary authors. If data was only available in graphical format, we thoroughly estimated the numeric values. Heterogeneity among studies was investigated by using the Chi2 test and I2 test, see protocol for details [22]. Risk for publication bias was reduced in our systematic review by ensuring a comprehensive search for eligible studies including three trial registries. Only a small set of studies was available for comparisons, so we did not provide a funnel plot.

Pooling of data and meta-analysis of studies was only considered among studies with similar design (e.g., RCTs were only combined with other RCTs) and limited heterogeneity. Combined estimates were not provided for studies with considerable differences in the included population or differences regarding interventions. We planned to provide estimates of treatment effects on a fixed effect model. We planned to calculate pooled risk ratios and 95 % confidence interval across comparable studies using Review Manager (RevMan 5.3). Subgroup analyses were planned to consider dosage of drugs, geographical origin of studies, length of treatment, and likelihood of diagnosis. Sensitivity analyses were planned to assess the effect of risk of bias in included studies. We used the Grading of Recommendations Assessment, Development and Evaluation (GRADE) approach to assess the quality of evidence for each outcome [25].

Results

The search identified 5779 bibliographic records after removal of duplicates, of which 5735 were excluded, and 44 full-text articles were retrieved for detailed examination (Fig. 1). We identified six eligible studies, two RCTs [26, 27], and four NRS (one prospective cohort study [28] and three retrospective cohort studies [29–31]. Reasons for exclusion of the remaining 38 studies are listed in Fig. 1. One retrospective cohort study reported on patients with ‘probable’ Lyme neuroborreliosis [30], all other studies included patients according to the ‘possible’ case definition.
Fig. 1
Fig. 1

PRISMA flow chart

The included studies compared different interventions, which are summarized in Table 1. We merged intervention groups with betalactam antibiotics together to be compared to patients treated with doxycycline. Three studies compared different kinds of betalactam antibiotics [26–28], one evaluated betalactam antibiotics and doxycycline [30], whereas two studies investigated a variety of interventions [29, 31].
Table 1

Characteristics of included studies

Study

Sample size

Case definition

Interventions

Length of treatment

Setting

Country

RCT

 Millner 1995

41

possible

penicillin G 300,000-375,000 IU/kg, ceftriaxone 100 mg/kg, sample size of groups not reported

14 days

Tertiary care center

Austria

 Müllegger 1991

23

possible

penicillin G 400,000-500,000 IU/kg (n = 11), ceftriaxone 75–93 mg/kg (n = 12)

14 days

Tertiary care center

Austria

Prospective cohort studies

 Jörbeck 1987

9

possible

penicillin G 150 mg/kg (n = 8), cefuroxime 4.5 g (n = 1)

10–19 days

Tertiary care center

Sweden

Retrospective cohort studies

  

 Thorstrand 2002

203

probable

ceftriaxone 100 mg/kg, maximum 2 g (n = 109), penicillin 100 mg/kg (n = 53), doxycycline 4 mg/kg, maximum 200 mg (n = 22), cefotaxime 100 mg/kg (n = 19)

10 days

Tertiary care center

Sweden

 Bingham 1995

19

possible

ceftriaxone, amoxicillin, erythromycin, penicillin, doxycycline, steroids, aciclovir or no treatment. Dosages not stated.

14–30 days

Tertiary care center

USA

 Skowronek-Bala 2008

9

possible

ceftazidim + doxycycline (n = 5), amoxicillin + doxycycline (n = 1), ceftazidim + amoxicillin (n = 1), doxycycline (n = 1), ceftazidim (n = 1)

3–6 weeks

Tertiary care center

Poland

The most frequent interventions were penicillin G (five studies), ceftriaxone (four studies) and doxycycline (two studies). No eligible studies evaluating treatment with hydroxychloroquine, azithromycin, minocycline or carbapenem antibiotics were identified. Length of treatment was 14 days in both RCTs. NRS showed considerable differences regarding length of treatment ranging from 10 to 30 days.

All studies had serious risk of bias issues (Fig. 2). RCTs suffered from poor reporting on allocation concealment, random sequence generation and lack of blinding. Risk of bias and poor reporting were even more problematic in NRS (Fig. 3). Sample bias, baseline confounding and blinding of outcome assessment were major issues in all studies. Interventions were described insufficiently in three NRS [28, 29, 31]. All expect one NRS had ‘critical’ overall risk of bias [30]. Selective reporting cannot be ruled out in any RCT or NRS, as no corresponding protocols were available.
Fig. 2
Fig. 2

Risk of bias in randomized controlled trials

Fig. 3
Fig. 3

Risk of bias in non-randomized studies

Data on neurological symptoms after pharmacologic treatment for the comparison of betalactam antibiotics against doxycycline could be extracted from three NRS [30, 31]. As two of these studies had critical risk of bias, data were not pooled [31]. Estimates from all studies had wide confidence intervals and showed no statistically significant difference between the two treatments (Fig. 4). No data regarding our secondary outcomes could be extracted.
Fig. 4
Fig. 4

Forest-plot for the comparison of betalactam antibiotics versus doxycycline for residual neurological symptoms in non-randomized studies

Data on neurological symptoms after pharmacologic treatment for the comparison of penicillin G against ceftriaxone could be extracted from one RCT and two NRS [26, 28, 30]. No estimate could be provided for the RCT, as no patients had neurological symptoms at last reported time point after treatment. The NRS could not be pooled due to critical risk of bias. Estimates from single studies had wide confidence intervals due to small sample sizes and showed no statistically significant differences between treatments (Fig. 5). Millner and colleagues compared treatment with penicillin G and ceftriaxone in an RCT, but did not provide data on sample sizes in treatment groups, so study data could not be combined with that of Müllegger and colleagues [26, 27]. The authors state that at last reported follow up (12 months after treatment) no participant had neurological symptoms in either treatment group. Millner and colleagues reported no adverse events for the penicillin G group, but moderate allergic skin rash (n = 1), elevated liver enzymes (n = 2), and asymptomatic bile concrements (n = 6) in the ceftriaxone group. Bile concrements were actively sought via sonography in the ceftriaxone group but not in the penicillin G group, which diminishes comparability. Adverse events reported in other studies could not be attributed to an intervention, so no comparison could be performed. No data regarding other secondary outcomes could be extracted.
Fig. 5
Fig. 5

Forest-plot for the comparison of penicillin G versus ceftriaxone for residual neurological symptoms

One retrospective cohort study with critical risk of bias reported data on neurological symptoms after treatment with combinations of antibiotic treatments against single drugs. The difference between these two heterogeneous groups was not statistically significant (RR 4.44, 95 % CI 0.96-20.50, p = 0.0558, Fig. 6).
Fig. 6
Fig. 6

Forest-plot for the comparison of combinations of antibiotic treatments versus single drugs on residual neurological symptoms

None of our pre-planned subgroup and sensitivity analyses considering dose, geographical origin, length of treatment, likelihood of diagnosis, or risk of bias were possible for any comparison due to the paucity of data.

The quality of evidence according to GRADE is presented in Tables 2, 3 and 4 [25]. Quality of evidence in RCTs as well as in NRS was very low, considerably lowering the overall confidence in the presented results. The reasons for down-rating the quality besides risk of bias in RCTs were risk of bias and imprecision, in NRS risk of bias, indirectness, and imprecision.
Table 2

GRADE evidence table for the comparison betalactam antibiotics vs. doxycycline for children with Lyme neuroborreliosis

Quality assessment

№ of patients

Effect

Quality

№ of studies

Study design

Risk of bias

Inconsistency

Indirectness

Imprecision

Betalactam antibiotics

Doxycycline

Relative (95 % CI)

Neurological symptoms at last reported time point

3

observational studies

very seriousa

not serious

seriousb

seriousc

15/195 (7.7 %)

3/25 (12.0 %)

not pooled

⨁◯◯◯ VERY LOW

abaseline confounding, selected patients, lack of blinding, interventions insufficiently described

bheterogeneous interventions, interventions not clearly described

csmall sample size, optimal information size not met

Table 3

GRADE evidence table for the comparison penicillin vs. ceftriaxone for children with Lyme neuroborreliosis

Quality assessment

№ of patients

Effect

Quality

№ of studies

Study design

Risk of bias

Inconsistency

Indirectness

Imprecision

Penicillin

Ceftriaxone

Relative (95 % CI)

Neurological symptoms at last reported time point

1

randomised trials

seriousa

not serious

not serious

very seriousb

0/11 (0.0 %)

0/12 (0.0 %)

not estimable

⨁◯◯◯ VERY LOW

Neurological symptoms at last reported time point

2

observational studies

very seriousc

not serious

seriousd

seriouse

2/55 (3.6 %)

4/28 (14.3 %)

not pooled

⨁◯◯◯ VERY LOW

ano blinding, randomisation and allocation concealment not stated appropriately, selective outcomes reporting cannot be excluded

bvery small sample size, optimal information size not met

cbaseline confounding, selected patients, lack of blinding, interventions insufficiently described

dheterogeneous interventions, interventions not clearly described

esmall sample size, optimal information size not met

Table 4

GRADE evidence table for the comparison combination of antibiotics vs. single drugs for children with Lyme neuroborreliosis

Quality assessment

№ of patients

Effect

Quality

№ of studies

Study design

Risk of bias

Inconsistency

Indirectness

Imprecision

Combination of antibiotics

Single drugs

Relative (95 % CI)

Neurological symptoms at last reported time point

1

observational studies

very seriousa

not serious

seriousb

seriousc

1/7 (14.3 %)

2/2 (100.0 %)

RR 4.44 (0.96 to 20.50)

⨁◯◯◯ VERY LOW

acritical risk of bias according to ARCOBAT NRSI due to baseline confounding, selected patients, lack of blinding, interventions insufficiently described

bheterogeneous interventions applied

csmall sample size, optimal information size not met

Discussion

A strength of this review is the comprehensive search of the available literature, including three databases for clinical trials and screening the reference list of included studies, minimizing the risk of bias in study selection. Due to the small number of studies included in these meta-analyses and considerable risk of bias, only limited conclusions can be drawn from them. We were unable to assess publication biases due to the low number of available studies for each of the comparisons.

Literature on pharmacological treatment of Lyme neuroborreliosis in children is scarce and with very limited quality. Most of the available studies were performed several decades ago when pharmacologic treatment was less rigorously assessed as it would be performed today in case of new drugs or indications.

The available evidence is insufficient to identify relevant differences between the evaluated antibiotics. However, due to small sample sizes and resulting imprecision in eligible studies, clinically relevant differences between treatments cannot be excluded.

Different strains of Borrelia burgdorferi show different patterns of geographical distribution [32]. Although five of six included studies were performed in Europe, results from this review may be also applicable in regions where distribution of these strains is different, as in North America, since neurological manifestations differ in frequency but not in clinical presentation. Only one study used the ‘probable’ case definition, whereas the other studies applied diagnostic criteria consistent with the ‘possible’ case definition. As this category often lacks CSF analysis, it is more broad compared to the other case definitions and therefore less specific. More ‘false positive’ patients may be included in studies using the “possible” case definition, probably diminishing treatment effects.

Currently an ongoing Cochrane review evaluates pharmacologic treatments for Lyme neuroborreliosis [33]. As treatment of Lyme neuroborreliosis in children is not the focus of the ongoing Cochrane review, applicability of its results on a pediatric population may be low.

Prognosis of Lyme neuroborreliosis in children after treatment appears to be good, irrespective of the antibiotic regimen studied in these trials. Unfavorable outcomes or poor treatment responses were infrequent regardless of which antibiotic was used. This is illustrated by the wide confidence intervals in pooled estimates due to paucity of respective unfavorable events.

Interpreting a limited body of evidence and drawing implications for clinical practice is difficult. No statistically significant difference was found between beta-lactam antibiotics and doxycycline regarding neurological symptoms after treatment. However, a relevantly lower rate of neurological symptoms for either drug cannot be excluded due to wide confidence intervals. Unfortunately, no data on adverse events were reported for this comparison, so we are unable to provide evidence-based conclusions regarding drug safety.

Doxycycline and beta-lactam antibiotics are recommended as alternative treatments by many guidelines, although use of doxycycline is usually not recommended for children <9 years because of the potential for impairing dental development [7, 16].

No statistically significant difference was found between penicillin G and ceftriaxone regarding neurological symptoms after treatment. Again, a relevantly lower rate of neurological symptoms for either drug cannot be excluded due to wide confidence intervals. Adverse events were only reported for children treated with ceftriaxone in one study (n = 9), but confidence in this result is rather low. Severity of these reported adverse events was generally mild and therefore may only partially influence treatment choice. Concordant with these findings, both penicillin G and ceftriaxone are recommended for treatment of Lyme neuroborreliosis in children by several guidelines [7, 16, 21].

No statistically significant difference was found between combination of antibiotics and single drugs. Confidence in this result is very low, as data was only reported in one retrospective cohort study with a small sample size (n = 9) with heterogeneous treatments, follow-up periods and critical risk of bias issues. Therefore, no convincing evidence for combination of antibiotics being superior to treatments with single antibiotics could be identified. This is in contrast with recommendations for combination treatments from guidelines developed by patient advocacy groups [17], but is in agreement with recommendations of guidelines from scientific societies [16]. This finding is also in concordance with the evidence from available studies on treatment of Lyme neuroborreliosis in adults [34].

However, besides the very low quality of the available evidence and the lack of recent studies, it remains noteworthy for which interventions no evidence from eligible studies could be found at all. No studies comparing extended antibiotic treatments to treatments of 10–21 days could be found. No eligible studies evaluating treatment with macrolide antibiotics, antimalarial drugs or carbapenems in children with Lyme neuroborreliosis could be identified. The guideline recommendations for these treatment regimens from patient advocacy groups are not based on any published evidence [17].

As the provided estimates suffer from considerable imprecision, it is likely that results of future clinical trials on this topic will change the presented results. Based on the available evidence, most questions arising in clinical practice remain unanswered.

One issue of considerable interest is whether oral treatment with doxycycline may be sufficient to treat early forms of Lyme neuroborreliosis including facial palsy with lymphocytic pleocytosis in children >8 years. No studies evaluated extended antibiotic treatment regimes. As long as such a treatment is not evaluated in a high quality trial, recommendations favoring such regimes remain ill-founded. The scarcity of high quality trials and the lack of recent studies is rather surprising. There is clearly a need for large high quality trials evaluating pharmacological treatments for Lyme neuroborreliosis in children. The included population should be adequately described according to consensus derived case definitions [35]. Trials should be registered prior to enrolment of the first patient and use predefined outcomes. However due to the good clinical results of present treatments used during the last 30 years in children it might be difficult to find a sponsor for large high quality trials evaluating pharmacological treatments for Lyme neuroborreliosis in children.

Conclusion

According to the available evidence, there seems to be no difference between different antibiotic agents for the treatment of Lyme neuroborreliosis in children regarding neurological symptoms. No eligible study compared different treatment durations. We found no evidence that supports extended antibiotic regimes.

Abbreviations

CI: 

Confidence interval

CSF: 

Cerebrospinal fluid

GRADE: 

Grading of Recommendations Assessment, Development and Evaluation

NRS: 

Non-randomized studies

RCT: 

Randomized controlled trial

RoB: 

Risk of bias

RR: 

Relative risk

Declarations

Acknowledgements

We thank Edith Motschall, for helping us with the development of search strategies and Olaf Minakowski, for helping us in the assessment of studies in Polish language.

Funding

This article was funded by the German Academy of Neurology and the Medical Center – University of Freiburg. The article processing charge was funded by the German Research Foundation (DFG) and the Albert Ludwigs University Freiburg in the funding programme Open Access Publishing.

Availability of data and materials

All the data supporting or findings, as extracted from the original studies, is contained within the manuscript or in the respective.

Authors’ contributions

RD designed the study, drafted the manuscript, extracted data, performed the risk of bias assessment. TH extracted data, performed the risk of bias assessment. SS extracted data, performed the risk of bias assessment. HS made substantial contributions to the analysis of the data. SR made substantial contributions to conception and design, data interpretation. JJM performed the risk of bias assessment, made substantial contributions to conception and design, data interpretation. HH made substantial contributions to conception and design, data interpretation. All authors approved the final manuscript as submitted and agreed to be accountable for all aspects of the work.

Competing interests

SR reports receiving consulting and lecture fees, grant and research support from Bayer Vital GmbH, Biogen Idec, Merck Serono, Novartis, Sanofi-Aventis, Baxter, RG, and Teva. Furthermore, SR indicates that he is a founding executive board member of ravo Diagnostika GmbH. TH received travel grants from Bayer Vital GmbH and Novartis. All other authors have no conflicts of interest relevant to this article to disclose.

Consent for publication

Not applicable.

Ethics approval and consent to participate

Not applicable.

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

Authors’ Affiliations

(1)
Cochrane Germany, Medical Center-University of Freiburg, Berliner Allee 29, D-79110 Freiburg im Breisgau, Germany
(2)
Department of Neurology, Medical Center-University of Freiburg, Breisacher Str. 64, D-79106 Freiburg, Germany
(3)
UroEvidence@Deutsche Gesellschaft für Urologie, Berlin, Germany
(4)
Institute of Medical Biometry and Statistics, Medical Center-University of Freiburg, Stefan-Meier-Str- 26, D-79104 Freiburg, Germany
(5)
Prof.-Hess-Kinderklinik, Klinikum Bremen-Mitte, Sankt-Jürgen-Str. 1, D-28177 Bremen, Germany
(6)
Centre de Recherche Épidémiologie et Statistique INSERM Sorbonne Paris, Cochrane France, Hôpital Hôtel-Dieu, 1 place du Parvis Notre Dame, 75181 Paris Cedex 04, France

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