1. Rhinology Unit & Smell Clinic, Otorhinolaryngology Department, Hospital Clinic, Universitat de Barcelona, Barcelona, Spain
2. Rhinology and Skull Base Unit, Otorhinolaryngology Department, Hospital Clinic, Universitat de Barcelon, Barcelona, Spain
3. Clinical & Experimental Respiratory Immunoallergy (IRCE), Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
4. Biomedical Reaserch Networking Centers of Respiratiry Diseases (CIBERES), Madrid, Spain