[1] Klagenfurt General Hospital,Department of Oto
[2] Guy’s and St Thomas’ Hospital,Rhino
[3] Hospital de la Santa Creu i Sant Pau. Universitat Autònoma de Barcelona,Laryngology
[4] King’s College London Guy’s Hospital,Department of Otorhinolaryngology Head and Neck Surgery
[5] Royal Marsden Hospital,Department of Otorhinolaryngology and Head and Neck Surgery
[6] University of Cologne,Department of Head and Neck Pathology
[7] CH Luxembourg,Department of Otorhinolaryngology Head and Neck Surgery
[8] Leiden University Medical Center,Department of Otorhinolaryngology, Head and Neck Surgery, Medical Faculty
[9] ASST Spedali Civili of Brescia,Department of Otorhinolaryngology, Head and Neck Surgery
[10] University of Brescia,Department of Otorhinolaryngology, Head and Neck Surgery