1 Respiratory Unit, ASST Santi Paolo e Carlo, San Paolo Hospital, Department of Health Sciences, Università degli Studi di Milano, Milan, Italy. Electronic address: [email protected].
2 Respiratory Unit, ASST Santi Paolo e Carlo, San Paolo Hospital, Department of Health Sciences, Università degli Studi di Milano, Milan, Italy.
3 ASST Lodi, UOC Pneumologia, Lodi, Italy.
4 Lung Disease Unit, Department of Clinical and Experimental Medicine, University of Sassari, Sassari, Italy.
5 Department of Biomedical Sciences and Public Health, Università Politecnica delle Marche; the Pulmonology Unit, AOU "Ospedali Riuniti", Ancona, Italy.
6 ASST Mantova, Dipartimento Cardio-Toraco-Vascolare, Unità Operativa di Pneumologia e UTIR, Mantova, Italy.
7 Clinical Epidemiology and Medical Statistics Unit, Department of Clinical and Experimental Medicine, University of Sassari, Sassari, Italy.