1. Head and Neck Department; Institut Gustave Roussy; Villejuif France
2. Otorhinolaryngology and Head and Neck Surgery Department; Huriez Hospital; University of Lille; France
3. Otorhinolaryngology and Head and Neck Surgery Department; Santa Chiara Hospital; Trento Italy
4. Biostatistics and Epidemiology Department; Institut Gustave Roussy; Villejuif France
5. Head and Neck Department; Centre Oscar Lambret; Lille France