1. Department of Epidemiology, New England Research Institutes, Inc., Watertown, Massachusetts.
2. Massachusetts General Hospital, Vincent OB/GYN Service, Boston, Massachusetts.
3. Department of Psychology and Department of Obstetrics and Gynaecology, University of Western Ontario, Canada.
4. Center for Sexual Medicine at Sheppard Pratt-Johns Hopkins Department of Psychiatry and Behavioral Sciences, Baltimore, Maryland.
5. Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut.