1 Department of Research, Norwegian Air Ambulance Foundation, Postboks 39 1441, Drøbak, Norway
2 Department of Anaesthesiology, Oslo University Hospital, Rikshospitalet, Postboks 4950, Nydalen 0424, Oslo, Norway
3 Trauma unit, Department of Surgery, Academic Medical Centre, University of Amsterdam, Meibergdreef 9, Amsterdam, 1105, AZ, Netherlands
4 Department of Anesthesiology, University of Alabama at Birmingham, 1720 2nd Ave S, Birmingham, 35233, AL, USA
5 NHS Blood Transplant and Oxford Univeristy Hospitals NHS Trust, John Radcliffe Hospital, Headley Way, Headington, Oxford OX3 9DU, UK
6 Trauma Sciences, Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building 4 Newark Street E1 2AT, London, UK
7 Section for Transfusion Medicine, Capital Region Blood Bank, Rigshospitalet, University of Copenhagen, Klinisk Immunologisk Afdeling Rigshospitalet Blegdamsvej 9 2100 København Ø, Copenhagen, Denmark
8 Department of Surgery, University of Texas Medical School, 6414 Fannin Street 77030, Houston, TX, USA
9 Department of Traumatology, Oslo University Hospital,Ullevål, Postboks 4950 Nydalen 0424, Oslo, Norway