1 Department of Obstetrics and Gynecology, Advocate Illinois Masonic Medical Center, 836 W. Wellington, Chicago, IL 60657; University of Illinois at Chicago, Chicago, IL. Electronic address: Elliot.levine@aah.org.
2 Director of Gynecologic Ultrasound, Department of Obstetrics and Gynecology, Advocate Illinois Masonic Medical Center, Chicago, IL.