1 Division of Thoracic Surgery and Lung Transplantation, Department for the Treatment and Study of Cardiothoracic Diseases and Cardiothoracic Transplantation, IRCCS ISMETT, Palermo, Italy.
2 Division of Thoracic Surgery, Careggi Hospital, Firenze, Italy.
3 Division of Thoracic Surgery, Policlinico Ca'Granda, Milano, Italy.
4 Department of Thoracic Surgery, AUSL Romagna Teaching Hospital, Forlì, Italy.
5 Division of Thoracic Surgery, ASST Mantova-Cremona, Mantova, Italy.
6 Division of Thoracic Surgery, Università dell'Aquila, L'Aquila, Italy.