[1] Univ Manchester, Fac Biol Med & Hlth, Sch Med Sci, Div Canc Sci, Manchester, Lancs, England
[2] Christie Natl Hlth Serv NHS Fdn Trust, Dept Radiotherapy Related Res, Manchester, Lancs, England
[3] Paul Scherrer Inst, Ctr Proton Therapy, Villigen, Switzerland
[4] Cantonal Hosp Aarau, Dept Radiat Oncol, Aarau, Switzerland
[5] Gustave Roussy Canc Campus, Radiotherapy Dept, Villejuif, France
[6] Erasmus Univ, Erasmus Sch Hlth Policy & Management, Rotterdam, Netherlands
[7] European Soc Radiotherapy & Oncol ESTRO, Young Comm, Brussels, Belgium
[8] Bern Univ Hosp, Div Med Radiat Phys, Inselspital, Bern, Switzerland
[9] Bern Univ Hosp, Dept Radiat Oncol, Inselspital, Bern, Switzerland
[10] Univ Bern, Bern, Switzerland
[11] Maastricht Univ, GROW Sch Oncol & Reprod, Dept Precis Med, Lab M, Maastricht, Netherlands
[12] Univ Milan, Dept Oncol & Hematooncol, Milan, Italy
[13] IRCCS, IEO European Inst Oncol, Div Radiotherapy, Milan, Italy
[14] European Soc Radiotherapy & Oncol ESTRO, Natl Soc Comm, Brussels, Belgium
[15] Maria Sklodowska Curie Natl Res Inst Oncol, Dept Soft Tissue Bone Sarcoma & Melanoma, Warsaw, Poland
[16] Erasmus MC Canc Inst, Dept Radiotherapy, Rotterdam, Netherlands
[17] Univ Piemonte Orientale, Dept Translat Med, Novara, Italy
[18] Henri Becquerel Canc Ctr, Dept Radiat Oncol & Med Phys, Rouen, France
[19] Natl Ctr Oncol Hadron therapy CNAO, Pavia, Italy