Affiliation: | a Department of Obstetrics and Gynecology, Meharry Medical College, Nashville, Tennessee b Department of Obstetrics and Gynecology, Penn State College of Medicine, Hershey, Pennsylvania c Department of Public Health Sciences, Penn State College of Medicine, Hershey, Pennsylvania d Department of Pathology, Penn State College of Medicine, Hershey, Pennsylvania e Department of Pediatrics, Penn State College of Medicine, Hershey, Pennsylvania f Department of Kinesiology, Penn State College of Health and Human Development, University Park, Hershey, Pennsylvania g Department of Obstetrics and Gynecology, Virginia Commonwealth University, Richmond, Virginia |