[1] Paracelsus Med Univ Nuremberg, Dept Cardiac Surg, Nurnberg, Germany
[2] Univ Hosp Pontchaillou, Dept Thorac & Cardiovasc Surg, Rennes, France
[3] Univ Leicester, Glenfield Hosp, Cardiac Surg, Leicester, Leics, England
[4] Osped Circolo Varese, Cardiac Surg Unit, Dept Heart & Vessels, Varese, Italy
[5] Univ Verona, Div Cardiac Surg, I-37100 Verona, Italy
[6] Osped Riuniti, Div Cardiac Surg, Trieste, Italy
[7] V Monaldi Hosp, Dept Cardiothorac & Resp Sci, Naples, Italy
[8] Univ Hosp Jean Minjoz, Dept Thorac & Cardiovasc Surg, Besancon, France
[9] Karolinska Univ Hosp, Dept Cardiothorac Surg & Anesthesia, Stockholm, Sweden
[10] Karolinska Univ Hosp, Dept Mol Med & Surg, Stockholm, Sweden
[11] Univ Catania, Cardiac Surg Unit, AOU Policlin Vittorio Emanuele, Catania, Italy
[12] San Camillo Hosp, Dept Cardiac Surg, Rome, Italy
[13] Univ Hosp Munster, Dept Cardiac Surg, Munster, Germany
[14] Univ Oulu, Dept Surg, Oulu, Finland