1. Cardiovascular and Thoracic Department, SC Pneumologia U, Città della Salute e della Scienza (Molinette) University Hospital, Turin, Italy
2. Department of Translational Medicine, Pneumology Unit U, University of Piemonte Orientale, Vercelli, Italy
3. Allergy & Respiratory Diseases, DIMI Department of Internal Medicine, University of Genoa, Genoa, Italy