1. Department of Radiation Oncology; Hospital of the University of Pennsylvania; Philadelphia Pennsylvania
2. Department of Radiation Oncology; Mayo Clinic; Scottsdale Arizona
3. Department of Radiation Oncology; University of Nebraska Medical Center; Omaha Nebraska
4. Division of Hematology/Oncology; Department of Medicine, Hospital of the University of Pennsylvania; Philadelphia Pennsylvania
5. Department of Radiation Oncology; University of Washington Medical Center; Seattle Washington
6. Department of Radiation Oncology; University of Maryland School of Medicine; Baltimore Maryland