[1] Univ Torino, Dept Surg Sci, Turin, Italy
[2] Azienda Osped Univ Citta Salute & Sci Torino, Dept Thorac Surg, Turin, Italy
[3] Azienda Osped Univ Citta Salute & Sci Torino, Dept Anaesthesia Intens Care & Emergency, Turin, Italy
[4] Univ Torino, Dept Surg Sci, Corso Dogliotti 14, I-10126 Turin, Italy