1. Otorhinolaryngology Department; Hospital Clinic; Barcelona Spain
2. ENT Surgical Oncology Section; Hospital Clinic; Barcelona Spain
3. University of Barcelona, Faculty of Medicine; Barcelona Spain
4. Otorhinolaryngology Department; Hospital del Esperit Sant; Santa Coloma de Gramanet Spain
5. Otorhinolaryngology Department, Hospital Joan XXIII, IISPV; Universitat Rovira i Virgili; Tarragona Spain