1. Rhinology Unit and Smell Clinic, Department of Otorhinolaryngology, Hospital Clínic i Universitari, Barcelona
2. Centro de Investigación Biomédica en Red de Enfermedades Respiratorias (CIBERes), Barcelona, Spain
3. Pneumology and Respiratory Allergy, Hospital Clínic, Barcelona
4. Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona
5. Department of Medicine, University of Barcelona, Barcelona