[1] Donostia Univ Hosp, Biodonostia Res Inst, Dept Otorhinolaryngol, San Sebastian 20014, Spain
[2] Deusto Univ, Dept Otorhinolaryngol, Fac Med, Bilbao, Spain
[3] Univ Mons, UMONS Res Inst Hlth Sci & Technol, EpiCURA Hosp,Div Laryngol & Broncho Esophagol, Dept Otolaryngol & Head & Neck Surg, Mons, Belgium
[4] Univ Sassari, Dept Med Surg & Pharm, Maxillofacial Surg Operat Unit, Sassari, Italy
[5] Univ Sassari, Sch Biomed Sci, Dept Biomed Sci, Sassari, Italy
[6] Hosp Univ Bellvitge, Dept Otorhinolaryngol Head & Neck Surg, Barcelona, Spain
[7] Inst Invest Biomed Bellvitge IDIBELL, Barcelona, Spain
[8] Morgagni Pierantoni Hosp, Dept Head Neck Surg, Head Neck & Oral Surg Unit, Otolaryngol, I-47121 Forli, Italy
[9] Complexo Hosp Univ A Coruna CHUAC, Otorhinolaryngol Head & Neck Surg Dept, La Coruna 15006, Galicia, Spain
[10] Hosp Univ Fdn Jimenez Diaz, ENT & Cervicofacial Surg Dept, Madrid, Spain
[11] Univ Alfonso X el Sabio, Dept Otorhinolaryngol, Fac Med, Madrid, Spain
[12] Head Neck Study Grp Young Otolaryngologists Int F, Paris, France
[13] Young Confederat European Otorhinolaryngol Head &, Vienna, Austria