[1] Saarland Univ, Dept Thorac & Cardiovasc Surg, Med Ctr, Homburg, Germany
[2] Catholic Univ Louvain, Pole Rech Cardiovasc, Inst Rech Expt & Clin IREC, Brussels, Belgium
[3] Clin Univ St Luc, Div Cardiothorac & Vasc Surg, Brussels, Belgium
[4] Univ Hosp Hradec Kralove, Dept Cardiac Surg, Hradec Kralove, Czech Republic
[5] Univ Ottawa, Div Cardiac Surg, Heart Inst, Ottawa, ON, Canada
[6] Mt Sinai Hosp, Dept Cardiovasc Surg, Icahn Scholl Med Mt Sinai, New York, NY 10029 USA
[7] European Hosp, Dept Cardiac Surg, Rome, Italy
[8] Inst Mutualiste Montsouris, Dept Cardiac Surg, Paris, France
[9] Univ Penn, Div Cardiac Surg, Philadelphia, PA 19104 USA