1. Department of Obstetrics and Gynecology, NorthShore University HealthSystem, Evanston, IL, USA
2. Deptartment of Obstetrics and Gynecology, University of Chicago Pritzker School of Medicine, Chicago, IL, USA
3. Department of Radiology, NorthShore University HealthSystem, Evanston, IL, USA
4. Department of Pediatrics, NorthShore University HealthSystem, Evanston, IL, USA