1 Professor and Vice Chair, Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, University of Tennessee Medical Center, 1930 Alcoa Highway Suite A-435, Knoxville, TN 37920. Electronic address: ctowers@utmck.edu.
2 Associate Professor, Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, University of Tennessee Medical Center, Knoxville, TN 37920.