1. Department of Paediatrics, University of Toronto, Division of Haematology/Oncology, and
2. Program in Cell Biology, Research Institute, The Hospital for Sick Children, Toronto, ON, Canada;
3. Department of Biochemistry, University of Toronto, Toronto, ON, Canada;
4. Department of Medicine, Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, ON, Canada;
5. Department of Laboratory Medicine & Pathobiology, University of Toronto, Toronto, ON, Canada;
6. Department of Internal Medicine and Molecular Medicine Program, Eccles Institute of Human Genetics, University of Utah, Salt Lake City, UT;
7. Department of Pediatrics and Human Medical Genetics Program, University of Colorado Denver, Aurora, CO; and
8. Department of Medicine, University of Toronto, Division of Rheumatology University Health Network, Toronto Western Hospital, Toronto, ON, Canada