1. Massachusetts General Hospital; Boston Massachusetts USA
2. Puget Sound Blood Center and University of Washington Medical Center; Seattle Washington USA
3. New England Research Institutes; Watertown Massachusetts USA
4. Beth Israel Deaconess Medical Center; Boston Massachusetts USA
5. University of Pittsburgh; Pittsburgh Pennsylvania USA
6. Brigham and Women's Hospital; Boston Massachusetts USA
7. University of North Carolina; Chapel Hill North Carolina USA
8. New York Blood Center; New York New York USA
9. University of Maryland; Baltimore Maryland USA
10. Johns Hopkins University; Baltimore Maryland USA
11. Cleveland Clinic; Cleveland Ohio USA
12. Tulane University Hospital and Clinics; New Orleans Louisiana USA
13. University of Iowa; Iowa City Iowa USA
14. Froedert Memorial Lutheran Hospital; Milwaukee Wisconsin USA
15. Children's Hospital; Boston Massachusetts USA
16. Weill Cornell Medicine; New York New York USA
17. Duke University; Durham North Carolina USA