1. Department of Laboratory Medicine, St. Jospeh's Hospital. and the Department of Pathology, McMaster University, Hamilton, Ontario, Canada.
2. St. Joseph's Hospital, Hamilton, Ontario, Canada.
3. Departments of Pathology and Medicine, McMaster University, and Director of Hematology, St. Joseph's Hospital, Hamilton, Ontario, Canada.
4. Department of Medicine, McMaster University, Hamilton, Ontario, Canada.
5. Department of Medicine, McMaster University, and St. Joseph's Hospital, Hamilton, Ontario, Canada.
6. Department of Pediatrics, McMaster University, and St. Joseph's Hospital. Hamilton, Ontario, Canada.