1. Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine; University of Cincinnati College of Medicine; Cincinnati OH USA
2. Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine; The Methodist Hospital; Houston TX USA
3. Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine; University of Toledo College of Medicine and Life Sciences; Toledo OH USA