1. Department of Obstetrics and Gynecology, Maimonides Medical Center, Brooklyn, New York
2. Department of Preventive Medicine, SUNY Downstate Medical Center, Brooklyn, New York
3. Department of Obstetrics and Gynecology, Maimonides Medical Center, Brooklyn, New York and Department of Obstetrics and Gynecology, SUNY Downstate Medical Center, Brooklyn, New York