1. Thoracic Surgery Unit, Department of Cardiac, Thoracic, Vascular Sciences and Public Health, University of Padova, 35121 Padova, Italy
2. Unit of Biostatistics Epidemiology and Public Health, Department of Cardiac, Thoracic, Vascular Sciences and Public Health, University of Padova, 35121 Padova, Italy
3. Lung Transplant Unit, University of Siena, Azienda Ospedaliero-Universitaria Senese, 53100 Siena, Italy
4. Respiratory Disease and Lung Transplant Unit, University of Siena, Azienda Ospedaliero-Universitaria Senese, 53100 Siena, Italy
5. Department of Thoracic Surgery, University and Hospital Trust-Borgo Trento, 37126 Verona, Italy