(1)UMC Utrecht, Department of Radiation Oncology, Utrecht, The Netherlands;(2)AKH Medical University/General Hospital of Vienna, Department of Radiation Oncology-Comprehensive Cancer Center, Vienna, Austria;(3)Aarhus University Hospital, Department of Oncology, Aarhus, Denmark;(4)Gustave-Roussy, Department of Radiotherapy, Villejuif, France;(5)Tata Memorial Hospital, Department of Radiation Oncology, Mumbai, India;(6)Mount Vernon Hospital, Mount Vernon Cancer Centre, Northwood, United Kingdom;(7)Institute of Oncology Ljubljana, Department of Radiotherapy, Ljubljana, Slovenia;(8)The Norwegian Radium Hospital-Oslo University Hospital, Department of Oncology, Oslo, Norway;(9)Postgraduate Institute of Medical Education and Research, Department of Radiotherapy and Oncology, Chandigarh, India;(10)Cross Cancer Institute and University of Alberta, Department of Oncology, Edmonton, Canada;(11)St James's University Hospital, Leeds Cancer Centre, Leeds, United Kingdom;(12)Radiotherapiegroep Arnhem, Department of Radiotherapy, Arnhem, The Netherlands;(13)UZ Leuven, Department of Radiation Oncology, Leuven, Belgium;(14)Leiden University Medical Center, Department of Radiation Oncology, Leiden, The Netherlands;

(1)Faculty of Medicine- University of Tsukuba, Radiation Oncology & Proton Medical Research Center, Tsukuba, Japan;(2)University of Tsukuba Hospital, Radiation Oncology & Proton Beam Therapy Center, Tsukuba, Japan;(3)Kobe Proton Center, Radiation Oncology, Kobe, Japan;(4)Ibaraki Prefectural Central Hospital, Radiation Oncology, Kasama, Japan;