1. Department of Obstetrics and Gynecology; College of Physicians and Surgeons; Columbia University; New York NY USA
2. Department of Epidemiology; Joseph L. Mailman School of Public Health; Columbia University; New York NY USA
3. Division of Maternal-Fetal Medicine; Department of Obstetrics and Gynecology; College of Physicians and Surgeons; Columbia University; New York NY USA
4. Division of Gynecologic Oncology; Department of Obstetrics and Gynecology; College of Physicians and Surgeons; Columbia University; New York NY USA