1. Department of Medicine, Asthma, Allergy and Clinical Immunology Section, University of Verona, Verona, Italy
2. Allergy and Asthma Unit, Verona University Hospital, Verona, Italy
3. Respiratory Medicine Unit, Verona University Hospital, Verona, Italy
4. Department of Surgery, Medicine, Molecular Biology and Critical Care, University of Pisa, Pisa, Italy
5. Division of Otorhinolaryngology, Department of Surgery, Dentistry, Gynecology, and Pediatrics, University of Verona, Verona University Hospital, Verona, Italy