Affiliation: | (1) Development and Research Training in Human Reproduction, Department of Reproductive Health and Research, World Health Organization, UNDP/UNFPA/WHO/World Bank Special Programme of Research, 20, Avenue Appia, 1211 Geneva 27, Switzerland;(2) Division of Obstetrics and Gynecology, Department of Woman and Child Health, Karolinska Hospital, Stockholm S171-76, Sweden |