1. Department of Radiology Mayo Clinic Rochester Minnesota 55905 USA
2. Department of Medical Physics Memorial Sloan‐Kettering Cancer Center New York New York 10065 USA
3. Department of Radiation Oncology University of Wisconsin Madison Wisconsin 53792‐0600 USA
4. Department of Radiation Oncology University of California, Los Angeles Los Angeles California 90095‐6951 USA
5. Department of Medical Physics Cross Cancer Institute Edmonton Alberta AB T6G 1Z2 Canada
6. Department of Human Oncology University of Wisconsin Madison Wisconsin 53726 USA
7. Department of Radiology/Radiological Sciences Queen's Medical Center Honolulu HI 96813 USA
8. Department of Radiation Oncology Washington University School of Medicine St. Louis MO 63110 USA
9. Department of Radiation Oncology Virginia Commonwealth University Glen Allen VA 23059 USA
10. Department of Radiation Oncology Medical College of Wisconsin Milwaukee Wisconsin 53226 USA
11. Department of Radiology Augusta University Augusta GA 30912 USA
12. Department of Imaging Physics University of Wisconsin Madison WI 53705 USA
13. Department of Medical Physics University of Vermont Medical Center Burlington VT 05401 USA
14. Department of Radiation Oncology UC Davis Medical Center Sacramento California 95817 USA
15. Department of Radiology University Hospitals Cleveland Medical Center Cleveland Ohio 44106 USA
16. Department of Radiation Oncology Washington University St Louis Richmond VA 23298‐0058 USA
17. Department of Radiation Oncology University of Michigan Ann Arbor MI 48109 USA
18. Department of Radiology University of Washington Seattle WA 98195‐7987 USA
19. Department of Imaging Physics UT MD Anderson Cancer Center Houston TX 77030‐4095 USA
20. Department of Radiology/Radiological Sciences Stanford University Stanford CA 94305‐4245 USA