1 Department of Pulmonology, Haematology and Oncology. Division of Pulmonology and Allergy Unit. High Speciality "A.Cardarelli" Hospital, Naples, Italy.
2 Postgraduate School of Respiratory Medicine, Department of Experimental Medicine, University of Rome "Tor Vergata", Rome, Italy.
3 Department of Experimental Medicine, Unit of Respiratory Medicine, University of Rome "Tor Vergata", Rome, Italy.
4 Division of Pulmonology, S. Corona Hospital, Pietra Ligure, Italy.
5 Department of Internal Medicine, Allergy Unit University Hospital Ospedali Riuniti - Department of Clinical and Molecular Sciences, Polytechnic University of Marche, Ancona, Italy.