Affiliation: | 1. Departments of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Parkland Health and Hospital System, Dallas, Texas, USA;2. Departments of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Parkland Health and Hospital System, Dallas, Texas, USA Department of Radiology, University of Texas Southwestern Medical Center, Parkland Health and Hospital System, Dallas, Texas, USA Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, Texas, USA |