German Red Cross Blood Transfusion Service and Goethe University Clinics, Frankfurt/Main, Germany. Centre for Evidence-Based Practice (CEBaP), Belgian Red Cross, Mechelen, Belgium. Department of Anaesthesiology, Intensive Care Medicine and Pain Therapy, University Hospital Frankfurt, Frankfurt/Main, Germany. European Blood Alliance (EBA), Amsterdam, the Netherlands. Departments of Intensive Care and of Anesthesia, University Hospital of Brest, Brest, France. Robert-Koch-Institut (RKI), Berlin, Germany. Robert Wood Johnson Medical School, Rutgers University, New Brunswick, New Jersey. Paul-Ehrlich-Institut (PEI), Langen, Germany. Department of Public Health and Primary Care, Faculty of Medicine, KU Leuven, Leuven, Belgium. Canadian Blood Services, Ottawa, Ontario, Canada. Departments of Medicine, Surgery, Epidemiology and Public Health, University of Ottawa, Ottawa, Ontario, Canada. Societe Francaise de Transfusion Sanguine (SFTS), Paris, France. Intensive Care, Western Health, Melbourne, Australia. Fairview Health Services, Minneapolis, Minnesota. OneBlood, Orlando, Florida. Department of Cardiothoracic Intensive Care Medicine, Duke University Medical Centre, Durham, North Carolina. National Health Service Blood and Transplant and University of Oxford, Oxford, United Kingdom. St. Michael's Hospital and University of Toronto, Toronto, Canada. Sanquin Blood Bank, Leiden and Department of Haematology, Groene Hart Hospital, Gouda, the Netherlands. International Society of Blood Transfusion (ISBT), Amsterdam, the Netherlands. Etablissement Francais du Sang (EFS), Saint-Denis, France. Department of Clinical Epidemiology, Faculty of Medicine and Health Sciences, Stellenbosch University, Stellenbosch, South Africa. Departments of Anesthesiology and Bioengineering, University of Pittsburgh Medical Centre, Pittsburgh, Pennsylvania. Transfusion Research Unit, Department of Epidemiology and Preventive Medicine, Monash University, Melbourne, Australia.