1. Rhinology Unit & Smell Clinic, ENT Department, Hospital Clínic, Universitat de Barcelona. Barcelona, Catalonia, Spain
2. Clinical and Experimental Respiratory Immunoallergy, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS). Barcelona, Catalonia, Spain
3. Center of Biomedical Research in Respiratory Diseases (CIBERES). Barcelona, Catalonia, Spain
4. Hospital Son Espases. Palma de Mallorca, Illes Balears, Spain
5. Rhinology and Skull Base Surgery Unit, ENT Department, Ramon y Cajal University Hospital. Madrid, Spain