1. Department of Radiation Oncology, Howard University, Washington, DC 20059, USA
2. Department of Radiation Oncology, Johns Hopkins University, Baltimore, MD 21218, USA
3. Radiation Oncology Proton Therapy, OSF HeathCare Cancer Institute, University of Illinois, Peoria, IL 61603, USA
4. Department of Radiation Oncology, Mohammed VI University of Health Sciences, Casablanca 82403, Morocco
5. Department of Radiation Oncology, Centre Hospitalier Public du Cotentin, 50100 Cherbourg-en-Cotentin, France
6. Department of Oral Surgery, Cancer Tech Care Association, Perpignan 66000, France
7. Colorectal Research Center, Department of Radiation Oncology, Shiraz University of Medical Sciences, Shiraz 71348-14336, Iran
8. Department of Radiation Oncology, ASST Papa Giovanni XXIII, 24127 Bergamo, Italy
9. Department of Radiation Oncology, Sant Joan de Reus University Hospital, University of Rovira I Virgili, 43007 Tarragona, Spain
10. Department of Radiation Oncology, Arnau de Vilanova University Hospital, 25198 Lleida, Spain
11. Department of Radiation Oncology, Fernando Pessoria Canarias Las Palmas University, 35002 Las Palmas, Spain
12. Division of Neuro-Oncology, Mount Sinai Hospital, New York, NY 10029, USA
13. Department of Radiation Oncology, Clinique Sainte Clotilde, 97400 Saint Denis, France
14. Department of Radiation Oncology, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy
15. Radiation Oncology, Department of Medical and Surgical Sciences (DIMEC), Alma Mater Studorium, Bologna University, 40126 Bologna, Italy
16. Department of Radiation Oncology, Institut Curie, 75005 Paris, France
17. Department of Radiation Oncology, International Geriatric Radiotherapy Group, Washington, DC 20001, USA
18. Department of Oral Maxillofacial Surgery, Howard University, Washington, DC 20059, USA
19. Department of Radiation Oncology, Capital University Xuanwu Hospital, Beijing 100053, China