[1] Ruhr Univ Bochum, Heart & Diabet Ctr North Rhine Westphalia, Inst Anesthesiol & Pain Therapy, Bad Oeynhausen, Germany
[2] Univ Bern, Bern Univ Hosp, Inselspital, Inst Clin Chem, Bern, Switzerland
[3] Univ Bern, Bern Univ Hosp, Inselspital, Dept Anesthesiol & Pain Med, Bern, Switzerland
[4] Duke Univ, Sch Med, Dept Anesthesiol, Durham, NC USA
[5] Duke Univ, Sch Med, Dept Crit Care, Durham, NC USA
[6] Duke Univ, Sch Med, Dept Surg, Durham, NC USA