1 Department of Obstetrics and Gynecology, University of North Carolina-Chapel Hill, Director of Reproductive Genetics, Director of the Maternal Serum Screening Laboratory, Chapel Hill, North Carolina Department of Obstetrics and Gynecology, Women and Infant's Hospital, Rhode Island, Director, Perinatal Genetics, Co-Director, Prenatal Diagnosis Center, Director, Maternal Fetal Medicine Fellowship, Providence, Rhode Island.