1. Department of Gynecology and Obstetrics, Universidade de Ribeirão Preto (UNAERP), Ribeirão Preto, Brazil.
2. Department of Gynecology and Obstetrics, Medical School of Ribeirao Preto, University of São Paulo, São Paulo, Brazil.
3. Departament of Social Medicine, Medical School of Ribeirao Preto, University of São Paulo, São Paulo, Brazil.