1. Asthma Center and Allergy Unit, Verona University Hospital, Verona, Italy
2. Department of Medicine, University of Verona, Verona, Italy
3. Local Health Unit N. 2 “Marca Trevigiana”, Public Health Department, Treviso, Veneto Region, Italy
4. Respiratory Pathophysiology Division, University-City Hospital of Padua, Padua, Italy
5. Pulmonary Unit, Verona University Hospital, Verona, Italy
6. Pulmonary Unit, Presidio Ospedaliero di Pordenone, Pordenone, Italy
7. Respiratory Unit, Orlandi General Hospital, Verona, Italy