1. Cardiothoracic and Vascular Anesthesia, University-Hospital of Udine, Udine, Italy,
2. Cardiothoracic and Vascular Anesthesia, University-Hospital of Udine, Udine, Italy
3. Institute of Hygiene and Epidemiology, DPMSC, University-Hospital of Udine, Udine, Italy
4. Department of Vascular Surgery, University-Hospital of Udine, Udine, Italy