1. Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California San Diego, San Diego, CA, USA
2. Department of Obstetrics and Gynecology, University of California Irvine, Irvine, CA, USA
3. Department of Obstetrics and Gynecology, University of California, Davis, Sacramento, CA, USA
4. Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California, San Francisco, San Francisco, CA, USA
5. Department of Obstetrics and Gynecology, University of California, Los Angeles, Los Angeles, CA, USA