1. Thoracic Surgery and Breast Unit, Department of Surgical Sciences, Tor Vergata University Polyclinic, Viale Oxford 81, 00133 Rome, Italy
2. Division of Thoracic Surgery, IRCCS Humanitas Research Hospital, Via Manzoni 56, Rozzano, 20089 Milan, Italy
3. Department of Biomedical Sciences, Humanitas University, Via Rita Levi Montalcini 4, Pieve Emanuele, 20090 Milan, Italy
4. Unit of Cardio-thoracic Surgery, Southampton General Hospital, Tremona Road, Southampton SO166YD, UK