[1] Univ Hosp Virgen Macarena, Dept Otolaryngol Head & Neck Surg, Rhinol Unit, Seville, Spain
[2] Western Univ, Dept Otolaryngol Head & Neck Surg, London, ON, Canada
[3] Tel Aviv Univ, Sackler Fac Med, Dept Otolaryngol Head & Neck Surg, Tel Aviv, Israel
[4] Univ Hosp Santiago De Compostela, Dept Otolaryngol, Santiago De Compostela, Spain
[5] Univ Hosp Jerez, Dept Otolaryngol & Head & Neck Surg, Cadiz, Spain
[6] Univ Catania, Dept Med Surg Sci & Adv Technol GF Ingrassia, Catania, Italy
[7] Univ Milan, Santi Paolo & Carlo Hosp, Dept Hlth Sci, Otolaryngol Unit, Milan, Italy
[8] Donostia Univ Hosp, Biodonostia Res Inst, Otorhinolaryngol Head & Neck Surg Dept, St Sebastien, Spain
[9] Aix Marseille Univ, Concept Univ Hosp, Dept Oto Rhino Laryngol Head & Neck Surg, APHM,USTI,CNRS,La Conception Univ Hosp, Marseille, France
[10] Cairo Univ, Kasr Alainy Sch Med, Otorhinolaryngol Head & Neck Surg Dept, Giza, Egypt
[11] Elsan Hosp, Dept Otolaryngol, Polyclin Poitiers, Poitiers, France
[12] Univ Barcelona, Hosp Clin, ENT Dept, Rhinol & Skull Base Unit,CIPERES, Barcelona, Spain
[13] St Antonio Abate Hosp, Dept Otorhinolaryngol, Azienda Sanit Univ Friuli Cent, Tolmezzo, Italy