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