1. School of Applied Sciences, University of Campinas; Rua Pedro Zaccaria, 1300 Limeira São Paulo Brazil 13484-350
2. Medical Center - University of Freiburg; Cochrane Germany; Berliner Allee 29 Freiburg BW Germany 79110
3. University Hospital Frankfurt, Goethe University; Department of Obstetrics and Gynaecology; Theodor-Stern-Kai 7 Frankfurt Hessen Germany 60596
4. Monash University/Monash Health; School of Nursing and Midwifery/Maternity Services; 246 Clayton Road Clayton Victoria Australia 3168