1. Department of Obstetrics and Gynaecology School of Medical Sciences University of Campinas Campinas Brazil
2. Department of Social Medicine Ribeirao Preto Medical School University of Sao Paulo Ribeirao Preto Sao Paulo Brazil
3. The UNDP/UNFPA/UNICEF/WHO/World Bank Special Programme of Research Development and Research Training in Human Reproduction Department of Reproductive Health and Research World Health Organization Geneva Switzerland
4. Federal University of Sao Paulo Sao Paulo Brazil
5. Maternal and Child Health Program Burnet Institute Melbourne Vic. Australia