1. Catalunya, Spain
2. Rhinology Unit, Department of Otorhinolaryngology (ICEMEQ), Hospital Clinic, Department of Medicine
3. Allergy Unit, Department of Pneumology and Allergy, Hospital Clinic, Department of Medicine
4. Department of Radiology, Hospital Clinic, Department of Medicine
5. Universtat de Barcelona, Catalunya, Spain
6. Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Hospital Clinic, Department of Medicine