1. Department of Health Policy and Management, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill
2. Lineberger Comprehensive Cancer Center, Chapel Hill, North Carolina
3. Department of Radiation Oncology, Memorial Cancer Institute, Memorial Healthcare System, Pembroke Pines, Florida
4. Department of Radiation Oncology, University of North Carolina at Chapel Hill, Chapel Hill
5. Cecil G. Sheps Center for Health Services Research, University of North Carolina at Chapel Hill, Chapel Hill