[1] Mt Sinai Sch Med, Dept Cardiothorac Surg, New York, NY 10029 USA
[2] Mt Sinai Sch Med, Dept Anesthesiol, Div Biostat, New York, NY 10029 USA
[3] Univ Leipzig, Heartctr, Dept Cardiac Surg, Leipzig, Germany
[4] Univ Med Ctr Freiburg, Ctr Cardiovasc, Dept Cardiovasc Surg, Freiburg, Germany