¹Kerudi Cancer Hospital, Bagalkot, J N Medical College, Belagavi, and Nanjappa Hospital, Shimoga, Karnataka, India. , Department of Medical and Pediatric Oncology,, Bagalkot, India; ²Shankar Hospital and Research Centre, Dertment of Medical Oncology, Bangalore, India; ³M S R Medical College, Department of Medical Oncology, Bangalore, India; ⁴I G M C shimla, Department of Pulmonary Medicine., Shimla, India; ⁵J N Medical College, Belagavi,, Department of Radiation Oncology., Belagavi, India

¹Maastricht University Medical Centre, Department of Radiation Oncology (Maastro), Maastricht, The Netherlands; ²Princess Margaret Cancer Centre, University of Toronto, Department of Neuroradiology and Head and Neck Imaging, Toronto, Canada; ³Princess Margaret Cancer Centre, University of Toronto, Department of Radiation Oncology, Toronto, Canada; ⁴Maastricht University Medical Centre, Department of Radiology, Maastricht, The Netherlands; ⁵Maastricht University , School for Mental Health and Sciences, Maastricht, The Netherlands; ⁶Princess Margaret Cancer Centre, University of Toronto, Department of Otolaryngology – Head & Neck Surgery, Toronto, Canada; ⁷ Princess Margaret Cancer Centre, University of Toronto, Department of Neuroradiology and Head and Neck Imaging, Toronto, Canada; ⁸Princess Margaret Cancer Centre, University of Toronto, Department of Biostatistics, Toronto, Canada; ⁹Princess Margaret Cancer Centre, University of Toronto, Department of Radiation Oncology, Toronto, Canada

(1)Genesis Care Nottingham, Radiotherapy, Nottingham, United Kingdom;(2)Genesis Care, Elstree, London, United Kingdom;(3)Genesis Care, Milton Keynes, Milton Keynes, United Kingdom;

¹Universitary Hospital, Radiation Oncology, Bordeaux, France; ²CENTRE AZUREEN DE CANCEROLOGIE, Radiation Oncology, MOUGINS, France; ³University of Burgundy, 3FEDERATION FRANCOPHONE DE CANCEROLOGIE DIGESTIVE (FFCD), EPICAD INSERM LNC-UMR 1231, DIJON, France; ⁴INSTITUT CURIE, Radiation oncology, PARIS, France; ⁵INSTITUT REGIONAL DU CANCER MONTPELLIER, Radiation Oncology, MONTPELLIER, France; ⁶CENTRE OSCAR LAMBRET, Radiation Oncology, LILLE, France; ⁷CHU de Pontchaillou, Gastroenterology, RENNES, France; ⁸Institut de cancérologie de Bourgogne GRReCC, Medical Oncology, DIJON, France; ⁹LEON BERARD, Medical Oncology, LYON, France; ¹⁰HOPITAUX CIVILS DE COLMAR, Gastroenterology, COLMAR, France; ¹¹CHBS - HOPITAL DU SCORFF, Radiotherapy and Oncology, LORIENT, France; ¹²ANNECY GENEVOIS, Radiotherapy, PRINGY, France; ¹³14Institut de Cancérologie Lucien Neuwirth, Radiotherapy and Oncology, SAINT PRIEST EN JAREZ, France; ¹⁴CENTRE PAUL STRAUSS, Oncology, STRASBOURG, France; ¹⁵Centre Hospitalier Universitaire de Dijon, EPICAD INSERM LNC-UMR 1231, University of Burgundy, Hepato-gastroenterology and Digestive Oncology, DIJON, France; ¹⁶HOPITAL SAINT LOUIS, Gastroenterology and digestive oncology , PARIS, France

(1)RTTQA group- Velindre Cancer Centre, Medical Physics, Cardiff, United Kingdom;(2)Oxford University Hospitals NHS Trust, o, Oxford, United Kingdom;(3)Leeds University, Leeds Clinical Trials Research Unit, Leeds, United Kingdom;(4)Mount Vernon Hospital, Mount Vernon Centre for Cancer, Northwood, United Kingdom;(5)University College London, UcL, London, United Kingdom;(6)Cardiff University Department of Cancer & Genetics, and Velindre Cancer Centre, Cardiff, United Kingdom;(7)St James University Hospital, Leeds Cancer Centre, Leeds, United Kingdom;