1. Division of Clinical Research, Fred Hutchinson Cancer Research Center, Seattle, WA;
2. Department of Medicine, University of Washington, Seattle, WA;
3. Department of Immunology, Genetics, and Pathology, University of Uppsala, Uppsala, Sweden;
4. Center for International Blood and Marrow Transplant Research, Milwaukee, WI;
5. Division of Hematology and Oncology, Medical College of Wisconsin, Milwaukee, WI;
6. Center for International Blood and Marrow Transplant Research, Minneapolis, MN;
7. Matchis Foundation, Leiden, The Netherlands; and
8. University Medical Center Utrecht, Utrecht, The Netherlands