1. Department of Obstetrics and Gynecology, Rio de Janeiro Federal University, Rio de Janeiro, RJ, Brazil
2. Department of Maternal Child, Fluminense Federal University, Niterói, RJ, Brazil
3. Vassouras University, Vassouras, RJ, Brazil
4. Department of Obstetrics, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, SP, Brazil
5. University of Brasilia, Brasília, DF, Brazil
6. Departamento de Ginecologia e Obstetrícia, Federal University of Santa Catarina, Florianópolis, SC, Brazil
7. Department of Obstetrics and Gynecology, School of Medical Sciences, State University of Campinas, Campinas, SP, Brazil
8. Department of Obstetrics and Gynecology, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
9. Department of Gynecology and Obstetrics, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil
10. Department of Gynecology and Obstetrics, Faculty of Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
11. Departamento de Obstetrícia e Ginecologia, Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brazil
12. Department of Gynecology and Obstetrics, Botucatu Medical School, São Paulo State University, Botucatu, SP, Brazil