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