Section for Transfusion Medicine, Capital Region Blood Bank, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark. Oslo University Hospital and University of Oslo, Oslo, Norway. Cologne-Merheim Medical Centre, University of Witten/Herdecke, Cologne, Germany. Oxford University Hospital NHS Trust, Oxford, UK. NHS Blood and Transplant, Bristol, UK. Laboratory of Experimental Intensive Care and Anesthesiology, Amsterdam University Medical Centres, Amsterdam, The Netherlands. Centre for Trauma Sciences, Queen Mary University of London, London, UK. Department of Anaesthesiology, Centre of Head and Orthopaedics, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark.