1. Unit of Respiratory Medicine Department of Experimental Medicine University of Rome “Tor Vergata” Rome 00133 Italy
2. Sackler Institute of Pulmonary Pharmacology Institute of Pharmaceutical Science King's College London London SE1 9NH UK
3. Department of Medicine and Surgery Respiratory Disease and Lung Function Unit University of Parma Parma 43126 Italy
4. Unit of Pharmacology Department of Experimental Medicine University of Campania “Luigi Vanvitelli” Naples 80138 Italy