¹University of Glasgow, Institute of Cancer Sciences, Glasgow, United Kingdom; ²University of Glasgow, Institute of Infection, Immunity and Inflammation, Glasgow, United Kingdom; ³University of Glasgow, School of Veterinary Medicine, Glasgow, United Kingdom; ⁴University of Glasgow, Cancer Research UK Beatson Institute , Glasgow, United Kingdom

¹Bristol Cancer Institute, Clinical Oncology, Bristol, United Kingdom; ²University of Bristol, Bristol Dental School, Bristol, United Kingdom

¹University Hospital Zürich, University of Zürich , Department of Radiation Oncology, Zürich, Switzerland; ²Università degli Studi di Torino, Radiation Oncology, Torino, Italy; ³Humanitas University, Pieve Emanuele (Milan), IRCCS Humanitas Research Hospital, Rozzano and Department of Biomedical Sciences, Milan, Italy; ⁴Universitair Ziekenhuis Gent, Radiation Oncology, Gent, Belgium; ⁵University of Brescia and IRCCS Sacro Cuore Don Calabria Hospital, Negrar, Radiation Oncology, Negrar, Italy; ⁶Azienda Ospedaliero-Universitaria Careggi Florence, Radiation Oncology, Florence, Italy; ⁷Radboud University Medical Center Nijmegen, Radiation Oncology, Nijmegen, The Netherlands; ⁸University of Milan, Milan, Italy and Division of Radiotherapy, IEO European Institute of Oncology, IRCCS, Department of Oncology and Hemato-oncology, Milan, Italy; ⁹Campus Kennedylaan, AZ Groeninge Kortrijk , Kortrijk, Belgium; ¹⁰Onze-Lieve-Vrouw Ziekenhuis, Radiation Oncology, Aalst, Belgium; ¹¹Catharina Ziekenhuis, Radiation Oncology, Eindhoven, The Netherlands; ¹²Hopital de Sion, Hopital du Valais , Sion, Switzerland; ¹³Universitario Campus Bio-Medico- Oncology Center, Policlinico , Roma, Italy; ¹⁴Hôpitaux universitaires de Genève - HUG - site de Cluse-Roseraie, Radiation Oncology, Geneva, Switzerland; ¹⁵Cliniques Universitaires Saint-Luc, Radiation Oncology, Brussels, Belgium; ¹⁶Inselspital, Universitätsspital , Radiation Oncology, Bern, Switzerland; ¹⁷Istituti Clinici Scientifici Maugeri, Radiation Oncology, Pavia, Italy; ¹⁸Division of Radiation Oncology, Institute of Oncology , Ljubljana, Slovenia; ¹⁹Radiotherapiegroep, Deventer, the Netherlands, Radiotherapiegroep, Deventer, the Netherlands, Deventer, The Netherlands; ²⁰European Organisation for Research and Treatment of Cancer (EORTC) , Headquarters, Brussels, Belgium

(1)Aarhus University Hospital, Department of Oncology, Aarhus, Denmark;(2)Medical University/General Hospital of Vienna, Department of Radiation Oncology- Comprehensive Cancer Center, Vienna, Austria;(3)Gustave-Roussy, Department of Radiotherapy, Villejuif, France;(4)Tata Memorial Hospital, Department of Radiation Oncology, Mumbai, India;(5)University Medical Centre Utrecht, Department of Radiation Oncology, Utrecht, The Netherlands;(6)Mount Vernon Hospital, Mount Vernon Cancer Centre, Northwood, United Kingdom;(7)Institute of Oncology Ljubljana, Department of Radiotherapy, Ljubljana, Slovenia;(8)Postgraduate Institute of Medical Education and Research, Department of Radiotherapy and Oncology, Chandigarh, India;(9)The Radium Hospital- Oslo University Hospital, Department of Oncology, Oslo, Norway;(10)Cross Cancer Institute and University of Alberta, Department of Oncology, Edmonton, Canada;(11)Radiotherapiegroep Arnhem, Department of Radiotherapy, Arnhem, The Netherlands;(12)St James's University Hospital, Leeds Cancer Centre, Leeds, United Kingdom;(13)UZ Leuven, Department of Radiation Oncology, Leuven, Belgium;(14)St. Olavs Hospital, Clinic of Oncology and Women's Clinic, Trondheim, Norway;(15)Amsterdam University Medical Centers- University of Amsterdam, Department of Radiation Oncology, Amsterdam, The Netherlands;(16)Leiden University Medical Center, Department of Radiation Oncology, Leiden, The Netherlands;