1 Department of Information, Evidence and Research, World Health Organization, Geneva, Switzerland.
2 Institute for Medical Information Processing, Biometry and Epidemiology, Pettenkofer School of Public Health, LMU Munich, Munich, Germany.
3 International Health Consulting Services, London, UK.
4 Department of Reproductive Health and Research including UNDP/UNFPA/UNICEF/WHO/World Bank Special Programme of Research, Development and Research Training in Human Reproduction (HRP), World Health Organization, Geneva, Switzerland.
5 Clinical Epidemiology Program of the Ottawa Hospital Research Institute and Department of Medicine, University of Ottawa, Ottawa, Canada.
6 Department of HIV/AIDS, World Health Organization, Geneva, Switzerland.
7 Department of Maternal, Newborn, Child and Adolescent Health, World Health Organization, Geneva, Switzerland.