1 Thoracic Surgery Unit, University of Milan, Ospedale San Paolo, Via A. di Roudinì, 8, 20142 Milan, Italy. Electronic address: alessandro.baisi@unimi.it.
2 Thoracic Surgery Unit, University of Milan, Ospedale San Paolo, Via A. di Roudinì, 8, 20142 Milan, Italy.
3 Department of Surgery, University of Milan, Milan, Italy.