1. Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas
2. NRG Oncology Statistics and Data Management Center, Philadelphia, Pennsylvania
3. Sydney Kimmel Comprehensive Cancer Center, The Johns Hopkins University School of Medicine, Baltimore, Maryland
4. Department of Radiation Oncology, Washington University in St Louis, St Louis, Missouri
5. Imaging and Radiation Oncology Core, Philadelphia, Pennsylvania
6. Division of Cardiothoracic Surgery, Medical College of Wisconsin, Milwaukee