1. University of Sao Paulo; Department of Obstetrics and Gynecology, Medical School of Ribeirao Preto; Avenida Bandeirantes, 3900, 8th floor ? Monte Alegre Ribeirao Preto Ribeirao Preto Brazil 14049-900
2. School of Medicine, University of São Paulo; Department of Obstetrics and Gynecology; Avenida Doutor Eneas de Carvalho Aguiar, 255 Sao Paolo Brazil 05403-010
3. University of Sao Paulo; School of Medicine; Avenida Doutor Eneas de Carvalho Aguiar, 255 Sao Paulo Brazil 05403-010
4. University of São Paulo; Department of Obstetrics and Gynecology, Medical School of Ribeirao Preto; Avenida Bandeirantes 3900 Ribeirão Preto Brazil 14049-900
5. Medical School of Ribeirão Preto, University of São Paulo; Department of Obstetrics and Gynecology; Avenida dos Bandeirantes, 3900 Ribeirão Preto Brazil 14049-900
6. State University of Campinas (UNICAMP); Department of Gynecology and Obstetrics; Rua Alexander Fleming, 101 Cidade Universitária Zeferino Vaz Campinas Sao Paulo Brazil 13083-881