1 From the Division of General Anaesthesiology, Emergency and Intensive Care Medicine, Department of Anesthesiology and Intensive Care Medicine, University Hospital of Graz (GAS, HS, HB-C), Institute for Medical Informatics, Statistics and Documentation (GS), Division of Anaesthesiology for Cardiovascular Surgery and Intensive Care Medicine, Department of Anesthesiology and Intensive Care Medicine (SH) and Division of the Special Anaesthesiology, Pain and Intensive Care Medicine, Department of Anesthesiology and Intensive Care Medicine, Medical University of Graz, Graz, Austria (AS-K).