[1] RWTH Aachen Univ Hosp, Dept Anesthesiol, Aachen, Germany
[2] Sunnybrook Hlth Sci Ctr, Dept Lab Med & Mol Diagnost, Toronto, ON, Canada
[3] Univ Hlth Network, Lab Med Program, Toronto, ON, Canada
[4] Univ Toronto, Dept Lab Med & Pathobiol, Toronto, ON, Canada
[5] Weill Cornell Med, Dept Pathol & Lab Med, New York, NY USA
[6] Weill Cornell Med, Dept Anesthesiol, New York, NY USA
[7] Zurich Univ Childrens Hosp, Dept Pediat Anesthesia, Steinwiesstr 75, CH-8032 Zurich, Switzerland