corrections illora darbar, São Paulo University 31 May 2011 On Table 2, last column: The correct is p>0.999, not p=0.999. The correct is p=0.153, not p=1.53. Competing interests None declared
corrections
31 May 2011
On Table 2, last column: The correct is p>0.999, not p=0.999. The correct is p=0.153, not p=1.53.
Competing interests
None declared