1. Department of Medical Physics School of Medicine and Public Health University of Wisconsin Madison WI 53705 USA
2. Department of Radiation Oncology Miami Cancer Institute Baptist Health South Florida Miami FL 33176 USA
3. Department of Radiation Medicine and Applied Science University of California – San Diego La Jolla CA 92093‐5004 USA
4. Department of Radiation Physics University of Texas MD Anderson Cancer Center Houston TX 77030 USA
5. Department of Radiation Oncology Lynn Regional Cancer Center Delray Beach FL 33484 USA
6. Department of Medical Physics McGill University Health Center Montreal QC H4A 3J1 Canada
7. Department of Radiation Oncology University of Iowa Hospital & Clinics Iowa City IA 52242‐1009 USA
8. Carleton Laboratory for Radiotherapy Physics Physics Department Carleton University Ottawa ON K1S 5B6 Canada
9. Department of Radiation Oncology Rhode Island Hospital Brown University Providence RI 02903 USA