1. Division of Obstetrics, Gynecology, and Gynecologic Subspecialties, Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California, San Francisco, CA, USA
2. Division of Reproductive Endocrinology and Infertility, Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California, San Francisco, CA, USA
3. Department of Epidemiology and Biostatistics, University of California, San Francisco, CA, USA