1. Jon J van Rood Center for Clinical Transfusion Research; Sanquin/Leiden University Medical Center; Leiden Netherlands
2. Department of Clinical Epidemiology; Leiden University Medical Center; Leiden Netherlands
3. Cochrane Haematology, Department I of Internal Medicine, Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf; Faculty of Medicine and University Hospital Cologne, University of Cologne; Cologne Germany
4. Transfusion Research Unit, School of Public Health and Preventive Medicine; Monash University; Melbourne Australia
5. Systematic Review Initiative; NHS Blood and Transplant; Oxford UK
6. Clinical, Research and Development; NHS Blood and Transplant; Oxford UK
7. Sanquin Blood Bank; Amsterdam Netherlands
8. Erasmus Medical Centre; Rotterdam Netherlands
9. Haematology/Transfusion Medicine; NHS Blood and Transplant; Oxford UK
10. Cochrane Cancer, Department I of Internal Medicine, Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf; Faculty of Medicine and University Hospital Cologne, University of Cologne; Cologne Germany