1. Department of Radiation Oncology; University of Southern California, Keck School of Medicine; Los Angeles California USA
2. Department of Radiation Oncology; Tom Baker Cancer Center; Calgary Alberta USA
3. Department of Radiation Oncology; University of California Los Angeles; Los Angeles California USA
4. Department of Radiation Oncology; University of Arizona Cancer Center at Dignity Health; Phoenix Arizona USA
5. Department of Radiation Oncology; Samuel Oschin Cancer Center; Cedars Sinai Medical Center; Los Angeles California USA