Institution: | 1. Department of Maternal-Fetal Medicine, Mayo Clinic College of Medicine, Rochester, Minnesota;2. Wake Forest Medical Center, Winston-Salem, North Carolina USA;3. Department of Maternal-Fetal Medicine, Maine Medical Center, Portland, Maine USA;4. Department of Maternal-Fetal Medicine, St Barnabas Medical Center, Livingston, New Jersey USA;5. Department of Maternal-Fetal Medicine, Good Samaritan Hospital, Cincinnati, Ohio USA |