1. Department of Medical and Surgical Sciences, University of Foggia, 71122 Foggia, Italy
2. Respiratory Diseases and Lung Transplantation Unit, Department of Medical and Surgical Sciences & Neuro-Sciences, University of Siena, 53100 Siena, Italy
3. Institute of Respiratory Diseases, Policlinico Riuniti of Foggia, 71122 Foggia, Italy