Affiliation: | a Rhinology Unit and Smell Clinic, Department of Otorhinolaryngology - Head & Neck Surgery, Hospital Clínic i Universitari de Barcelona, Barcelona, Spainb Department of Pneumology and Respiratory Allergy, Hospital Clínic i Universitari de Barcelona, Barcelona, Spainc Department of Radiology, Hospital Clínic i Universitari de Barcelona, Barcelona, Spaind Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spaine CIBER de Enfermedades Respiratorias (CIBERES), Barcelona, Spain |