4 Respiratory Physiology Unit, Department of Respiratory Medicine, Cochin Hospital, Université de Paris, 75013 Paris, France.
5 Istituti Clinici Scientifici Maugeri, IRCCS, Respiratory Rehabilitation Unit of the Institute of 28010 Veruno, Novara, Italy.
6 Istituti Clinici Scientifici Maugeri, IRCCS, Respiratory Rehabilitation of the Institute of Lumezzane, 25065 Brescia, Italy.
7 Istituti Clinici Scientifici Maugeri, IRCCS, Respiratory Rehabilitation Unit of the Institute of Cassano Delle Murge, 70124 Bari, Italy.
8 Allergy and Immunology Unit, Istituti Clinici Scientifici Maugeri, IRCCS, 27100 Pavia, Italy.
9 Clinical Epidemiology and Medical Statistics Unit, Department of Medical, Surgical and Experimental Sciences, University of Sassari, 07100 Sassari, Italy.