1. Department of Obstetrics and Gynecology, Faculdade de Medicina FMUSP; Universidade de Sao Paulo; Sao Paulo Brazil
2. Department of Nutrition, Faculty of Public Health; São Paulo University; Sao Paulo Brazil
3. Department of Statistics; Institute of Mathematics and Statistics, Sao Paulo University; Sao Paulo Brazil
4. Post Graduate program on Health Sciences; Cruzeiro do Sul University; Sao Paulo Brazil