1. Department of Obstetrics and Gynecology, Hospital of the University of Pennsylvania, Philadelphia, PA, USA;
2. Department of Biostatistics and Epidemiology, Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA, USA;
3. Gynecologic Cancer, Department of Surgery, Fox Chase Cancer Center, Philadelphia, PA, USA;
4. Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, Hospital of the University of Pennsylvania, Philadelphia, PA, USA