1. Department of Health Services Research, Management and Policy, University of Florida, Gainesville, FL
2. Department of Radiation Oncology, Banner MD Anderson Cancer Center, Gilbert, AZ
3. The University of Texas Health Science Center at Houston School of Public Health, Houston, TX
4. The University of Texas Health Science Center at Houston Medical School, Center for Clinical Research and Evidence-Based Medicine, Houston, TX
5. Department of Health Services Research and Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX