[1] Barcelona Univ, Hosp Clin, ENT Dept, Rhinol Skull Base Unit, Barcelona 08036, Spain
[2] Hosp Univ Miguel Servet, ENT Dept, Rhinol & Anterior Skull Base Unit, Zaragoza, Spain
[3] Fdn Jimenez Diaz Univ Hosp, ENT & Cervicofacial Surg Dept, Madrid, Spain
[4] GSK, Specialty Care Med Dept, Madrid, Spain
[5] Univ Hosp Jerez, ENT Dept, Rhinol & Asthma Unit, Jerez de la Frontera 11407, Cadiz, Spain