1. Department of Radiation Oncology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia
2. Department of Biostatistics and Epidemiology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia3Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia
3. Department of Radiation Oncology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia4Leonard Davis Institute of Health, Perelman School of Medicine at the University of Pennsylvania, Philadelphia
4. Division of Urologic Oncology, Department of Surgery, Fox Chase Cancer Center, Temple University Health System, Philadelphia, Pennsylvania
5. Leonard Davis Institute of Health, Perelman School of Medicine at the University of Pennsylvania, Philadelphia6Department of Statistics, The Wharton School at the University of Pennsylvania, Philadelphia
6. Department of Biostatistics and Epidemiology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia
7. Department of Radiation Oncology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia7Department of Medical Ethics and Health Policy, Perelman School of Medicine at the University of Pennsylvania, Philadelphia