1. University of Washington Medical Center, Seattle, WA
2. Cleveland Clinic
3. American Radium Society, Mount Royal, NJ
4. New York-Presbyterian Hospital, New York, NY
5. Providence Health, Eureka
6. University Hospitals Seidman Cancer Center/Case Western Reserve University School of Medicine, Cleveland, OH
7. Long Beach VA Medical Center, Long Beach
8. Keck School of Medicine, Los Angeles, CA
9. Department of Radiation Oncology, Stritch School of Medicine, Cardinal Bernardin Cancer Center, Loyola University Chicago, Chicago
10. Department of Radiation Oncology, Maguire Center, Maywood, IL
11. Rakuten-Medical, South Florida Proton Therapy Institute, Delray Beach, FL