1. Departments of Pathology and Laboratory Medicine and Obstetrics and Gynecology; Alpert Medical School of Brown University; Providence Rhode Island 02912
2. Department of Epidemiology and International Health Institute; Brown University School of Public Health; Providence Rhode Island 02912
3. Department of Chronic Disease Epidemiology; Yale School of Public Health; New Haven Connecticut 06520
4. Department of Obstetrics and Gynecology; Tupua Tamasese Meaole Hospital, National Health Service, Government of Samoa; Apia Samoa
5. Bureau of Statistics, Government of Samoa; Apia Samoa
6. Ministry of Health, Government of Samoa; Apia Samoa