1. Department of Obstetrics and Gynecology, University of Vermont, Burlington, Vermont; University of Arizona College of Medicine, Tucson, Arizona; Department of Obstetrics and Gynecology, University of Chicago, Chicago, Illinois; Department of Obstetrics and Gynecology, Northwestern University, Chicago, Illinois; Department of Obstetrics and Gynecology, Geisinger Health System, Danville, Pennsylvania;
2. Department of Obstetrics and Gynecology, University of Vermont, Burlington, Vermont; University of Arizona College of Medicine, Tucson, Arizona; Department of Obstetrics and Gynecology, University of Chicago, Chicago, Illinois; Department of Obstetrics and Gynecology, Northwestern University, Chicago, Illinois; Department of Obstetrics and Gynecology, Geisinger Health System, Danville, Pennsylvania