1. Department of Radiation Oncology University of Texas Southwestern Medical Center Dallas Texas
2. Harold Simmons Comprehensive Cancer Center University of Texas Southwestern Medical Center Dallas Texas
3. Dana‐Farber Cancer Institute Harvard Medical School Boston Massachusetts
4. Division of Biostatistics, Department of Clinical Sciences University of Texas Southwestern Medical Center Dallas Texas
5. Department of Statistical Science Southern Methodist University Dallas Texas
6. Department of Clinical Sciences University of Texas Southwestern Medical Center Dallas Texas
7. Department of Radiation Oncology Brigham and Women's Hospital Boston Massachusetts
8. McGraw/Patterson Center for Population Sciences Dana‐Farber Cancer Institute Boston Massachusetts