1. Department of Obstetrics and Gynecology; University of California, Los Angeles; Los Angeles CA USA
2. Division of Reproductive Endocrinology and Infertility in the Department of Obstetrics and Gynecology; Cedars-Sinai Medical Center; Los Angeles CA USA
3. University of California, Los Angeles; Los Angeles CA USA
4. Division of Maternal Fetal Medicine in the Department of Obstetrics and Gynecology; Cedars-Sinai Medical Center; Los Angeles CA USA