1. Outcomes Research Group;,
2. Department of Anaesthesia and General Intensive Care, University of Vienna, Austria;,
3. Department of Anaesthesia, University of California, San Francisco, USA;,
4. Ludwig Boltzmann Institute for Clinical Anaesthesia and Intensive Care, Vienna, Austria;,
5. Department of Biochemistry and Molecular Biophysics, Columbia University College of Physicians and Surgeons, New York, USA