1 Department of Obstetrics and Gynecology, Warren Alpert Medical School of Brown University, Women & Infants Hospital, 101 Dudley Street, Providence, RI 02906. Electronic address: [email protected].
2 Department of Obstetrics and Gynecology, Warren Alpert Medical School of Brown University, Women & Infants Hospital, 101 Dudley Street, Providence, RI 02906.