[1] Univ Hosp Leuven, Dept Anesthesiol, Herestr 49, B-3000 Leuven, Belgium
[2] Katholieke Univ Leuven, Dept Cardiovasc Sci, Leuven, Belgium
[3] Katholieke Univ Leuven, Interuniv Inst Biostat & Stat Bioinformat, Leuven, Belgium
[4] Univ Hosp Leuven, Dept Cardiac Surg, Leuven, Belgium