1 Department of Obstetrics and Gynecology, Winthrop University Hospital, 259 First St., Mineola, NY 11501. Electronic address: avintzileos@winthrop.org.
2 Department of Obstetrics and Gynecology, College of Physicians and Surgeons, Columbia University, New York, NY; Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY.