1. Department of Paediatrics – Ribeirão Preto Medical School, University of São Paulo, São Paulo, Brazil
2. UNDP, UNFPA, UNICEF, WHO, World Bank Special Programme of Research, Development and Research Training in Human Reproduction (HRP), Department of Reproductive Health and Research, Geneva, Switzerland
3. Department of Social Medicine – Ribeirão Preto Medical School, University of São Paulo, São Paulo, Brazil
4. Department of Obstetrics and Gynaecology, University of Medical Sciences Teaching Hospital, Ondo State, Nigeria