1. Centre for Evidence-Based Practice, Belgian Red Cross, Mechelen, Belgium
2. Department of Public Health and Primary Care, Leuven Institute for Healthcare Policy, KU Leuven, Leuven, Belgium
3. German Red Cross Blood Service BaWüHe, Frankfurt, Germany
4. Institute for Transfusion Medicine and Immunohematology, Goethe University, Frankfurt, Germany
5. Division of Epidemiology and Biostatistics, Department of Global Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Stellenbosch Central, Stellenbosch, South Africa
6. Belgian Red Cross, Mechelen, Belgium