1. Department of Radiation Oncology; University of Pennsylvania, Abramson Cancer Center; Philadelphia Pennsylvania
2. Department of Biostatistics; University of North Carolina, Lineberger Comprehensive Cancer Center; Chapel Hill North Carolina
3. Department of Human Oncology; University of Wisconsin; Madison Wisconsin
4. Radiation Oncology Associates, Pennsylvania; Manchester New Hampshire
5. Department of Radiation Oncology; University of North Carolina, Lineberger Comprehensive Cancer Center; Chapel Hill North Carolina