1. Department of Radiation Oncology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA.
2. Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA.
3. Department of Biostatistics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA.