(1)Leiden University Medical Center LUMC, Radiotherapy, Leiden, The Netherlands;(2)Haaglanden Medical Center, Radiotherapy, The Hague, The Netherlands;(3)Haga Hospital, Radiotherapy, The Hague, The Netherlands;(4)Haaglanden Medical Center, Surgery, The Hague, The Netherlands;(5)Haaglanden Medical Center, Radiology, The Hague, The Netherlands;(6)Haaglanden Medical Center, Pathology, The Hague, The Netherlands;(7)Haga Hospital, Surgery, The Hague, The Netherlands;(8)Isala, Radiotherapy, Zwolle, The Netherlands;(9)Leiden University Medical Center LUMC, Statistics, Leiden, The Netherlands;

¹IEO European Institute of Oncology IRCCS, Division of Radiation Oncology, Milan, Italy; ²University of Milan, Department of Oncology and Hemato-Oncology, Milan, Italy; ³Istituto Nazionale Tumori IRCCS Fondazione G. Pascale, Vision of Radiation Oncology, Napoli, Italy; ⁴Centro Nazionale di Adroterapia Oncologica, Clinical Radiotherapy Unit, Pavia, Italy; ⁵Centro Nazionale di Adroterapia Oncologica, Medical Physics Unit, Pavia, Italy; ⁶University of Turin, Department of Radiation Oncology, Torino, Italy; ⁷University of Piemonte Orientale, Department of Translation Medicine, Radiotherapy Unit, Novara, Italy; ⁸MedAustron Center for Ion Therapy and Research, Medical Department, Wiener, Austria; ⁹Centro Nazionale di Adroterapia Oncologica, Clinical Department-Bioengineering Unit, Pavia, Italy; ¹⁰IEO European Institute of Oncology IRCCS, Epidemiology and Biostatistics Unit, Milan, Italy; ¹¹IEO European Institute of Oncology IRCCS, Unit of Medical Physics, Milan, Italy; ¹²IEO European Institute of Oncology IRCCS, Division of Head and Neck Surgery, Milan, Italy; ¹³IEO European Institute of Oncology IRCCS, Division of Urogenital and Head and Neck Tumors, Milan, Italy; ¹⁴IEO European Institute of Oncology IRCCS, Scientific Directorate, Milan, Italy

(1)Fondazione CNAO, Radiation Oncology, Pavia, Italy;

(1)Istituto Oncologico Veneto, Medical Physics, Padova, Italy;