1. Clinical Epidemiology Division, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden
2. Department of Cardiology, Södersjukhuset, Stockholm, Sweden
3. Vitalant Research Institute, San Francisco, California
4. Department of Laboratory Medicine, University of California San Francisco
5. RTI International, Rockville, Maryland
6. Department of Epidemiology Research, Statens Serum Institut, Copenhagen, Denmark
7. Division of Research, Kaiser Permanente Northern California, Oakland
8. American Red Cross, Connecticut Region, Farmington
9. Institute for Transfusion Medicine, Pittsburgh, Pennsylvania
10. Veterans Affairs Healthcare System, San Francisco, California
11. Department of Clinical Immunology, Aarhus University Hospital, Aarhus, Denmark
12. Department of Clinical Immunology, the Blood Bank, Rigshospitalet, University Hospital of Copenhagen, Copenhagen, Denmark
13. National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland
14. University of British Columbia, Victoria, Canada
15. Department of Hematology, Copenhagen University Hospital, Copenhagen, Denmark