Institution: | a Assistant professor, Department of Obstetrics and Gynecology, Washington University School of Medicine, St. Louis, MO b Assistant Professor, Department of Obstetrics and Gynecology, Washington University School of Medicine, St. Louis, MO c Chief resident, Department of Obstetrics and Gynecology, Washington University School of Medicine, St. Louis, MO d Third year resident, Department of Obstetrics and Gynecology, Washington University School of Medicine, St. Louis, MO e Second year resident, Department of Obstetrics and Gynecology, Washington University School of Medicine, St. Louis, MO f Fourth year medical student, Department of Obstetrics and Gynecology, Washington University School of Medicine, St. Louis, MO |