[1] Univ Munster, Dept Anesthesiol Intens Care & Pain Med, Albert Schweitzer Campus 1,Bldg A1, D-48149 Munster, Germany
[2] Baystate Hlth, Heart & Vasc Program, 759 Chestnut St, Springfield, MA 01199 USA
[3] Univ Massachusetts, Med Sch Baystate, 759 Chestnut St, Springfield, MA 01199 USA
[4] Baylor Coll Med, Dept Surg, One Baylor Plaza,MS BCM 390, Houston, TX 77030 USA
[5] Texas Heart Inst, Div Cardiovasc Surg, Houston, TX 77025 USA