1. Stanford University School of Medicine, Stanford, CA, USA
2. Stanford Prevention Research Center, Stanford University School of Medicine, Stanford, CA, USA
3. Jail Health Services, San Francisco Department of Public Health, San Francisco, CA, USA
4. Department of Internal Medicine, San Francisco General Hospital and University of California, San Francisco, CA, USA
5. Department of Obstetrics, Gynecology and Reproductive Sciences, University of California, San Francisco, CA, USA
6. Department of Obstetrics and Gynecology, Stanford University School of Medicine, Stanford, CA, USA