1. MT Rett, PT, MS, is a PhD student in the Department of Obstetrics and Gynecology, School of Medicine, Universidade Estadual de Campinas (UNICAMP), Campinas, São Paulo, Brazil
2. JA Simoes, MD, PhD, is Associate Professor, Department of Obstetrics and Gynecology, School of Medicine, UNICAMP, Caixa Postal 6181, 13084-971 Campinas, São Paulo, Brazil
3. V Herrmann, MD, PhD, is Assistant Professor, Department of Obstetrics and Gynecology, School of Medicine, UNICAMP
4. CLB Pinto, MD, PhD, is Assistant Professor, Department of Obstetrics and Gynecology, School of Medicine, UNICAMP
5. AA Marques, PT, PhD, is Director of the Physiotherapy Section, Department of Obstetrics and Gynecology, School of Medicine, UNICAMP
6. SS Morais is Statistician, Department of Obstetrics and Gynecology, School of Medicine, UNICAMP