1. University of Otago; Public Health and General Practice; Box 4345 Christchurch Canterbury New Zealand 8140
2. UN House Pulchowk; Health and Nutrition Section; P.O. Box 1187 Kathmandu Nepal
3. The Ohio State University; Division of Epidemiology; Columbus Ohio USA
4. FHI 360; Clinical and Epidemiological Sciences; 359 Blackwell St, Suite 200 Durham North Carolina USA 27701
5. Catharina Hospital Eindhoven; Department of Gynaecology, Division of Reproductive Medicine; Michelangelolaan 2 Eindhoven Netherlands NL 5623 EJ