1. Department of Radiation Oncology, Washington University School of Medicine, St. Louis, Missouri
2. Siteman Cancer Center, Barnes Jewish Hospital and Washington University School of Medicine, St. Louis, Missouri
3. Department of Radiation Oncology, Springfield Memorial Hospital, Springfield, Illinois
4. Division of Urology, Department of Surgery, Washington University School of Medicine, St. Louis, Missouri
5. Department of Radiation Oncology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania