1. Department of Obstetrics and Gynecology, The Reading Hospital of Tower Health System, Reading, PA, USA
2. Departments of Obstetrics and Gynecology, Sydney Kimmel Medical College of Thomas Jefferson University, Philadelphia, PA, USA
3. Department of Obstetrics, Gynecology and Reproductive Sciences, UCSF, San Francisco, CA, USA
4. Sutter East Bay Medical Foundation, Berkeley, CA, USA