1. Department of Family and Community Medicine, Gynecology and Reproductive Sciences, and Center for Reproductive Health Research; University of California; San Francisco (UCSF)
2. Department of Obstetrics, Gynecology and Reproductive Sciences, and Center for Reproductive Health Research; University of California; San Francisco (UCSF)
3. Institute for Prevention Research, Department of Preventive Medicine, Keck School of Medicine; University of Southern California; Los Angeles
4. Department of Biology; Scripps College; Claremont CA
5. Departments of Family and Community Medicine; Obstetrics, Gynecology and Reproductive Sciences; and Epidemiology and Biostatistics; UCSF