(1)University Medical Center Hamburg - Eppendorf UKE, Radiation Biology/Experimental Radiooncology, Hamburg, Germany;(2)University Medical Center Hamburg - Eppendorf UKE, Institute for Anatomy and Experimental Anatomy, Hamburg, Germany;(3)Technical University Dresden, OncoRay, Dresden, Germany;(4)University Medical Center Hamburg - Eppendorf UKE, Clinic for Radiotherapy, Hamburg, Germany;(5)University Medical Center Hamburg - Eppendorf UKE, Tumorbiology, Hamburg, Germany;

(1)University of Maastricht GROW Research Institute, Department of Precision Medicine, Maastricht, The Netherlands;(2)Maastricht University Medical Centre+, Department of Radiology and Nuclear medicine, Maastricht, The Netherlands;(3)Maastricht University Medical Centre+, Department of Radiation Oncology MAASTRO, Maastricht, The Netherlands;(4)University of Brescia, Unit of Otorhinolaryngology-Head and Neck Surgery, Brescia, Italy;(5)University of Brescia, Department of Medicine and Surgery, Brescia, Italy;(6)University Hospital Ulm, Dept. of Otorhinolaryngology- Head and Neck Surgery, Ulm, Germany;(7)University Hospital Düsseldorf, Dept. of Otorhinolaryngology- Head and Neck Surgery, Düsseldorf, Germany;(8)Amsterdam UMC, KNO-heelkunde/Hoofd-halschirurgie, Amsterdam, The Netherlands;(9)Amsterdam UMC, Department of Radiology, Amsterdam, The Netherlands;(10)University Medical Center Utrecht, Department of Radiotherapy, Utrecht, The Netherlands;(11)Antoni van Leeuwenhoek- Netherlands Cancer Institute, Department of Radiotherapy, Amsterdam, The Netherlands;(12)Antoni van Leeuwenhoek- Netherlands Cancer Institute, Department of Head and Neck Oncology and Surgery, Amsterdam, The Netherlands;(13)Fondazione IRCCS Istituto Nazionale dei Tumori, Department of Radiology, Milan, Italy;(14)University of Parma, Department of Radiology, Parma, Italy;(15)Fondazione IRCCS Istituto Nazionale dei Tumori, Head and Neck Medical Oncology Department, Milan, Italy;(16)University of Milan, Department of Oncology and Hematology-Oncology, Milan, Italy;(17)University of Parma, Department of Surgical Sciences, Parma, Italy;

¹Queen's Hospital, Radiotherapy Physics, Romford, United Kingdom; ²Queen's Hospital, Clinical Oncology, Romford, United Kingdom; ³Queen's Hospital, Radiotherapy, Romford, United Kingdom