1. Department of Anaesthesia and Intensive Care, Kuopio University Hospital, Kuopio, Finland;
2. School of Medicine, University of Eastern Finland, Kuopio, Finland;
3. Department of Medicine, Kuopio University Hospital, Kuopio, Finland;
4. Laboratory Division, Turku University Hospital, Turku, Finland;
5. Department of Clinical Chemistry, Faculty of Medicine, University of Turku, Turku, Finland