1. Head and Neck Cancer Medical Oncology Unit Fondazione IRCCS Istituto Nazionale dei Tumori Milan Italy
2. Radiology Unit Fondazione IRCCS Istituto Nazionale dei Tumori Milan Italy
3. Division of Epidemiology and Health Services Research Institute of Medical Biostatistics, Epidemiology and Informatics (IMBEI) University Medical Centre of Johannes Gutenberg‐University Mainz Germany
4. Radiotherapy 1 and 2 Units Fondazione IRCCS Istituto Nazionale dei Tumori Milan Italy
5. Pathology Unit Fondazione IRCCS Istituto Nazionale dei Tumori Milan Italy
6. Unit of Clinical Epidemiology and Trial Organization Fondazione IRCCS Istituto Nazionale dei Tumori Milan Italy
7. Medical Oncology Department University of Milan Milan Italy