1. Cardio-Thoracic and Vascular Department, University Hospital of Trieste, Trieste, Italy;
2. Department of Cardio-Thoracic Surgery, University Hospital of Udine, Udine, Italy;
3. Department of Infective Diseases, University Hospital of Udine, Udine, Italy;
4. Department of Thoracic and Cardiovascular Surgery, University Hospital Jean Minjoz, Besançon, France;
5. Department of Infective Diseases, University Hospital of Trieste, Trieste, Italy