1. Department of Otorhinolaryngology - Head and Neck Surgery, Hospital Universitario de Donostia, San Sebastian, Guipuzcoa, Spain
2. Department of ENT, Hospital Juan Canalejo de La Coruña, A Coruna, Galicia, Spain
3. Department of ENT, Azienda Ospedaliero Universitaria Careggi, Firenze, Toscana, Italy
4. Department of ENT, Università degli Studi di Verona, Verona, Veneto, Italy
5. Department of ENT, Hôpital Foch, Suresnes, Île-de-France, France
6. Department of ENT, Assistance Publique Hôpitaux de Marseille, Marseille, Provence-Alpes-Côte d'Azu, France
7. Department of ENT, Hôpital Hôtel Dieu de France, Beirut, Lebanon
8. Department of ENT, Hospital Universitario de Santiago de Compostela, Santiago de Compostela, Galicia, Spain
9. Department of ENT, Charles University, Praha, Czech Republic
10. Department of ENT, University of Montreal Hospital Centre, Montreal, Quebec, Canada