1. Department of Otorhinolaryngology Head and Neck Surgery; Luzerner Kantonsspital; Luzern Switzerland
2. Hearing and Balance Center; Dr El Hadi ENT Private Practice; Fès Morocco
3. Department of Otolaryngology and Skull Base Surgery; Pellegrin University Hospital; Bordeaux France
4. Otology-Neurotology Unit; Fondation Adolphe De Rothschild; Paris France
5. Department of Otorhinolaryngology Head and Neck Surgery; University of Antwerp; Antwerp Belgium
6. Department of Otorhinolaryngology Head and Neck Surgery; University of Grenoble; Grenoble France
7. Department of Otolaryngology; Lille University; Lille France
8. Department of Otorhinolaryngology Head and Neck Surgery; University of Montpellier; Montpellier France
9. Department of Otolaryngology; Tours University; Tours France