1 Department of Medicine, Respiratory Medicine Unit, University of Verona and Azienda Ospedaliera Universitaria Integrata of Verona, Verona, 37124, Italy. Electronic address: ernesto.crisafulli@univr.it.
2 Department of Medicine, Respiratory Medicine Unit, University of Verona and Azienda Ospedaliera Universitaria Integrata of Verona, Verona, 37124, Italy.
3 Department of Pulmonology, S. Maria della Misericordia University Hospital, Udine, Italy.