1. Smilow Cancer Center, Department of Therapeutic Radiology, Yale School of Medicine, New Haven, Connecticut
2. Department of Biostatistics, Yale School of Public Health, New Haven, Connecticut
3. Department of Radiation Therapy, Institut Curie, Paris, France
4. Department of Radiation Therapy, Oakland University William Beaumont School of Medicine, Royal Oak, Michigan
5. Department of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston
6. Department of Radiation Oncology, Harvard Medical School, Dana Farber Cancer Institute, Boston, Massachusetts
7. Department of Radiation Oncology, University of Pennsylvania, Philadelphia
8. Department of Radiation Oncology, University of Montreal, Hôpital Maisonneuve-Rosemont, Montreal, Quebec, Canada
9. Department of Radiation Oncology, McGill University Health Centre, Montreal, Quebec, Canada
10. Department of Radiation Therapy, Robert Wood Johnson Medical School, New Brunswick, New Jersey
11. Department of Radiation Oncology, British Columbia Cancer Agency, Victoria, British Columbia, Canada