1. World Health Organization; UNDP/UNFPA/UNICEF/WHO/World Bank Special Programme of Research, Development and Research Training in Human Reproduction (HRP), Department of Reproductive Health and Research; 20 Avenue Appia Geneva Geneve Switzerland 1211
2. University of Melbourne; Centre for Health Equity, Melbourne School of Population and Global Health; Level 4, 207 Bouverie Street Carlton Victoria Australia 3053
3. Johns Hopkins Bloomberg School of Public Health; Department of Population, Family and Reproductive Health; Baltimore Maryland USA
4. Norwegian Institute of Public Health; Oslo Norway