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; Avenue Appia 20 Geneva Switzerland CH-1211
2. University of Nairobi; Department of Obstetrics and Gynaecology; P.O. Box 19676 Nairobi Kenya 00202
3. Brighton and Sussex University Hospitals NHS Trust; Department of Obstetrics and Gynaecology; Royal Sussex County Hospital Eastern Road Brighton UK BN2 5BE
4. University of Milan, Children's Hospital "V. Buzzi"; Department of Obstetrics and Gynaecology; Via Castelvetro 32 Milano Italy 20154
5. University of Edinburgh Queen's Medical Research Centre; MRC Centre for Reproductive Health; Edinburgh UK EH16 4TJ
6. The University of Liverpool; Department of Women's and Children's Health; First Floor, Liverpool Women's NHS Foundation Trust Crown Street Liverpool UK L8 7SS