Correspondence to. University of Modena and Reggio Emilia Chair of Respiratory Medicine, Director Post-doctoral School in Respiratory Medicine, Azienda Ospedaliera-Universitaria di Modena, Policlinico, Director, Pneumology Unit, Largo del Pozzo 71, 41125 Modena, Italy.; University Hospital of Modena, Respiratory Diseases Unit, Department of Medical and Surgical Sciences SMECHIMAI, University of Modena Reggio Emilia, Italy
