Groupe d'Oncologie Radiothérapie Tête et Cou (GORTEC), University Paris-Saclay - Biostatistic and Epidemiology Unit, Gustave Roussy, Institut de cancérologie Strasbourg Europe (ICANS), University of Lille II - Centre Oscar Lambret, Centre Léon Berard, Medical Oncology, Institute of Cancerology of Lorraine - Alexis Vautrin, Hopital Nord Franche-Comté de Montbéliard, Centre Antoine Lacassagne, Hospital Duran i Reynals (ICO) - Catalan Institute of Oncology, Maria Skłodowska-Curie Institute of Oncology, CHU UCL Namur Site Sainte Elisabeth, Institut Claudius Regaud, Centre François Baclesse, CHRU Bretonneau, Sainte Catherine Institute, Centre Hospitalier de Bretagne Sud, University of Nantes - CHU Nantes, CHU Poitiers, Institut de Cancérologie Jean Godinot, Centre Henri Becquerel - Department of Radiation Oncology, Victor Hugo Clinic, Gustave Roussy, Centre Hospitalier de Valence, Institut Curie Hopital René Huguenin, Centre Hospitalier Pierre Bénite, ICO-Site René Gauducheau, Centre Marie Curie-Hôpital Privé Drôme Ardèche, Centre Hospitalier Départemental de Vendée, University of Bordeaux - CHU de Bordeaux, Hôpital Privé Sainte Marie, Gustave Roussy, Institut Català d'Oncologia, Hospital Universitario Cruces - Medical Oncology Department, Gustave Roussy, Gustave Roussy - Department of Head and Neck Oncology, Hospital Regional Universitario de Málaga, Groupe d'Oncologie Radiothérapie Tête et Cou (GORTEC), University of Paris-Saclay - Institut Gustave Roussy, Centre François Baclesse - Department of Radiation Oncology, Greater Poland Cancer Center - Gielkopolskie Centrun Onkologii im. Marii Curie-Sklodowskiej, - Section of Medical Oncology, Autonomous University of Barcelona - Medical Oncology Department and Gustave Roussy

University of Brescia - Medical Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori - Department of Research, Fondazione IRCCS Istituto Nazionale dei Tumori - Department of Research, University of Brescia - Medical Oncology Unit, King Hussein Cancer Center (KHCC), University Hospital of Bellvitge - Bellvitge Biomedical Research Institute (IDIBELL), Acibadem MAA University School of Medicine - Department of Radiation Oncology, University of Piemonte Orientale, University of Genova, Azienda Ospedaliero-Universitaria Careggi, Hospital Duran i Reynals (ICO) - Catalan Institute of Oncology, Kuwait Cancer Control Centre - Radiation Oncology Department, Azienda Ospedaliera-Universitaria Pisana, Thomas Jefferson University, Thomas Jefferson University, University of Giessen - Faculty of Medicine, University Hospital of Modena - Radiation Oncology Unit, Thomas Jefferson University, University of Brescia, University of Brescia, AOU Città della Salute e della Scienza di Torino, Autonomous University of Barcelona - Medical Oncology Department, Fondazione IRCCS Istituto Nazionale dei Tumori - Head and Neck Medical Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori - Head and Neck Medical Oncology Unit and Fondazione IRCCS Istituto Nazionale dei Tumori

Instituto de Investigación Sanitaria Hospital "12 de Octubre" - Hospital Universitario 12 de Octubre, affiliation not provided to SSRN, Hospital Duran i Reynals (ICO) - Catalan Institute of Oncology, affiliation not provided to SSRN, Hospital Clinico San Carlos, affiliation not provided to SSRN, Hospital Duran i Reynals (ICO) - Catalan Institute of Oncology, Hospital Universitario de Navarra, affiliation not provided to SSRN, Hospital Regional Universitario de Málaga, affiliation not provided to SSRN, Hospital Duran i Reynals (ICO) - Catalan Institute of Oncology, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Complejo Hospitalario Universitario de Toledo, affiliation not provided to SSRN, Vall d’Hebron Institute of Oncology (VHIO), Hospital Universitari i Politècnic La Fe, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN and Autonomous University of Barcelona - Medical Oncology Department