1. UC Berkeley – UCSF Joint Medical Program, UC Berkeley School of Public Health, University of California, Berkeley, Berkeley, CA, USA
2. School of Public Health, University of California, Berkeley, Berkeley, CA, USA
3. Department of Population and Family Health, Mailman School of Public Health, Columbia University, New York, NY, USA
4. Department of Obstetrics and Gynecology, College of Physicians and Surgeons, Columbia University, New York, NY, USA
5. Ibis Reproductive Health, Oakland, CA, USA