1. Department of PathologyBrigham and Women's Hospital Boston MA
2. Department of Pathology and Laboratory MedicineChildren's Hospital of Philadelphia Philadelphia PA
3. Department of Laboratory Medicine and PathologyUniversity of Minnesota Minneapolis MN
4. Department of PathologyUniversity of Vermont Burlington VT
5. Memorial Blood Centers St. Paul MN
6. Oxford University Hospitals Foundation Trust Oxford United Kingdom
7. Department of Pathology and Laboratory MedicineUCLA Health Los Angeles CA
8. Department of MedicineMcMaster University Hamilton Canada
9. Dartmouth‐Hitchcock Medical Center, Department of Pathology and Laboratory Medicine Lebanon NH
10. Department of PathologyMassachusetts General Hospital Boston MA
11. New Zealand Blood Service Auckland New Zealand
12. Department of Pathology and the Institute for Transfusion MedicineUniversity of Pittsburgh Pittsburgh PA
13. Department of Pathology and Genomic MedicineHouston Methodist Hospital Houston TX
14. Department of Pathology and Laboratory MedicineEmory University School of Medicine Atlanta GA
15. Canadian Blood Services Winnipeg Canada
16. Ospedale Maggiore Policlinico Milan Italy
17. Meir Medical Center Kfar Saba Israel
18. University Medicine Greifswald, Institute for Immunology and Transfusion Medicine Greifswald Germany
19. St. Paul's Hospital Vancouver Canada