1 Department of Chest Diseases, Division of Pneumology and Allergology, High Speciality "A.Cardarelli" Hospital, Naples, Italy. Electronic address: gennaro.liccardi@tin.it.
2 Department of Chest Diseases, Division of Pneumology and Allergology, High Speciality "A.Cardarelli" Hospital, Naples, Italy.
3 Department of Systems Medicine, University of Rome "Tor Vergata", Rome, Italy.
4 Allergy and Immunology Unit, Fondazione Salvatore Maugeri, IRCCS, Pavia, Italy.