1. Department of Intensive Care Medicine Tampere University Hospital PO Box 2000 Tampere 33521 Finland
2. Coagulation Disorders Unit Department of Clinical Chemistry HUSLAB Laboratory Services Helsinki University Hospital Helsinki Finland
3. Division of Intensive Care Medicine Department of Anesthesiology Intensive Care and Pain Medicine University of Helsinki and Helsinki University Hospital Helsinki Finland
4. Faculty of Social Sciences University of Tampere Tampere 33014 Finland