1. Allergy Outpatients Service, General Hospital, P. le Ospedale n. 1, 24047 Treviglio, Italy
2. Laboratory of Cellular and Molecular Allergology, San Raffaele Scientific Institute, Via Olgettina 58, 20132 Milan, Italy
3. Department of Medicine and Science of Ageing, G. D’Annunzio University, Chieti, Italy