1. Institute of Tropical Medicine, Antwerp, Belgium
2. London School of Hygiene and Tropical Medicine, London, UK
3. Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
4. World Health Organization, Department of Maternal, Newborn, Child and Adolescent Health and Ageing, Geneva, Switzerland
5. UNDP/UNFPA/UNICEF/WHO/World Bank Special Programme of Research, Development and Research Training in Human Reproduction (HRP), Department of Sexual and Reproductive Health and Research, World Health Organization, Geneva, Switzerland
6. Leiden University Medical Centre, Leiden, the Netherlands
7. Muhimbili University of Health and Allied Sciences, Dar es Salaam Tanzania (s)