1. Department of Obstetrics & Gynecology, SUNY Downstate Health Sciences University, Brooklyn, NY
2. Department of Obstetrics, Gynecology & Reproductive Sciences, Yale School of Medicine, New Haven, CT
3. Department of Obstetrics and Gynecology, Cooper University Hospital, Camden, NJ
4. Department of Obstetrics & Gynecology, New York University, New York
5. Department of Epidemiology and Biostatistics, SUNY Downstate Health Sciences University, Brooklyn, NY.