Michael Paal1, Uwe Liebchen2, Christina Barbara Kinast3. 1. Institute of Laboratory Medicine, University Hospital, Ludwig Maximilian University Munich, Munich, Germany. 2. Department of Anesthesiology, University Hospital, Ludwig Maximilian University Munich, Marchioninistrasse 15, 81377, Munich, Germany. uwe.liebchen@med.uni-muenchen.de. 3. Department of Anesthesiology, University Hospital, Ludwig Maximilian University Munich, Marchioninistrasse 15, 81377, Munich, Germany.