1. Department of Reproductive and Developmental Biology, Medical School, Ninewells Hospital, University of Dundee, Dundee, DD1 9SY, Scotland
2. Karolinska University Hospital and Karolinska Institutet, Stockholm, Sweden
3. University of Minnesota, Minneapolis, MN, USA
4. Baylor College of Medicine, Houston, TX, USA
5. Clinica Alemana de Santiago, Santiago, Chile
6. Hudson Institute of Medical Research, Clayton, Australia
7. Boston University School of Medicine and Boston Medical Center, Boston, MA, USA
8. Department of Reproductive Health and Research, Human Reproduction Programme, (HRP, The UNDP/UNFPA/UNICEF/WHO/World Bank Special Programme of Research, Development and Research Training in Human Reproduction), WHO, Geneva, Switzerland
9. Population Council, New York, NY, USA
10. Warren Alpert Medical School of Brown University, RI, USA
11. Department of Obstetrics and Gynaecology and Medicine, Keck School of Medicine, University of Southern California, CA, USA
12. Centre for Reproductive Medicine, Vrije Universiteit Brussel, Brussels, Belgium