1. Ear, Nose, and Throat Department; Lariboisière University Hospital; Paris France
2. Biostatistics and Clinical Epidemiology (ECSTRA) Team, UMR 1153 Inserm; Paris Diderot University, Saint-Louis Hospital, AP-HP; Paris France
3. Department of Otorhinolaryngology; Insubria University; Varese Italy
4. Department of Otorhinolaryngology; University of Brescia; Brescia Italy
5. Ear, Nose, and Throat Department; Rouen University Hospital; Rouen France
6. Department of Radiation Oncology; Ghent University Hospital; Ghent Belgium
7. Department of Otorhinolaryngology - Head and Neck Surgery; University Hospitals Leuven; Leuven Belgium
8. Department of Otorhinolaryngology, Head and Neck Surgery; University Hospital Bordeaux, F-X Michelet Center; Bordeaux Cedex France
9. Ear, Nose, and Throat Department; CHU Hôtel-Dieu; Nantes France