Affiliation: | a Department of Obstetrics and Gynecology, Eastern Virginia Medical School, CONRAD Clinical Research Center, Norfolk, VA b Department of Obstetrics and Gynecology, University of Texas Health Sciences Center at San Antonio, San Antonio, TX c Department of Biostatistics, Bioinformatics, and Epidemiology, Medical University of South Carolina, Charleston, SC d Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, SC |