[1] Columbia Univ, Med Ctr, Dept OB GYN, Div Maternal Fetal Med, New York, NY USA
[2] Columbia Univ, Mailman Sch Publ Hlth, New York, NY USA
[3] St Peters Univ Hosp, Rutgers Robert Wood Johnson Med Sch, OB GYN Residency Program, New Brunswick, NJ USA