[1] Univ Groningen Hosp, Dept Cardiol, NL-9700 RB Groningen, Netherlands
[2] Univ Groningen, Dept Clin Pharmacol, Groningen, Netherlands
[3] Univ Nijmegen Hosp, Inst Cardiothorac Surg, NL-6500 HB Nijmegen, Netherlands
[4] Univ Groningen Hosp, Dept Surg, NL-9700 RB Groningen, Netherlands
[5] Univ Innere Med 3, Poliklin Innere Med 3, Hamburg, Germany