1. Puget Sound Blood Center; Seattle Washington
2. Department of Laboratory Medicine; University of Washington; Seattle Washington
3. Seattle Children's Hospital; Seattle Washington
4. Children's Hospital Colorado; Denver Colorado
5. American Red Cross; Rockville Maryland
6. Ann & Robert H. Lurie Children's Hospital of Chicago; Chicago Illinois
7. Columbia University School of Medicine; New York New York
8. Boston Children's Hospital; Boston Massachusetts
9. Harvard Medical School; Boston Massachusetts
10. Children's National Medical Center; Washington District of Columbia
11. Children's Hospital of Philadelphia; Philadelphia Pennsylvania
12. Perelman School of Medicine, University of Pennsylvania; Philadelphia Pennsylvania