1 Department of Anaesthesiology and Intensive Care Medicine, Medical University of Innsbruck, Innsbruck 6020, Austria. Electronic address: petra.innerhofer@tirol-kliniken.at.
2 Department of General and Surgical Intensive Care Medicine, Medical University of Innsbruck, Innsbruck 6020, Austria.
3 Department of Anaesthesiology and Intensive Care Medicine, Medical University of Innsbruck, Innsbruck 6020, Austria.