1. University of Iceland School of Health Sciences; Landspitali National University Hospital; Reykjavik Iceland
2. Department of Anaesthesiology and Intensive Care Medicine; Landspitali National University Hospital; Reykjavik Iceland
3. Department of Anesthesiology, Perioperative and Pain Medicine; Brigham and Women's Hospital; Boston MA USA
4. Central Laboratory; Division of Laboratory Hematology and Coagulation Disorders; Landspitali National University Hospital; Reykjavik Iceland