1. Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada.
2. Department of Medicine, University of British Columbia, Vancouver, British Columbia V5Z 1M9, Canada.
3. Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V6H 3N1, Canada.
4. Leukemia/Bone Marrow Transplant Program of British Columbia, Vancouver, British Columbia V5Z 1M9, Canada.
5. Michael Smith Genome Sciences Centre, British Columbia Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada.