1. School of Medicine Queen's University Kingston Ontario Canada
2. Division of Cardiology, Department of Pediatrics The Hospital for Sick Children Toronto Ontario Canada
3. Thrombosis Program, Division of Hematology and Oncology, Department of Pediatrics The Hospital for Sick Children Toronto Ontario Canada
4. Pediatrics Lakeridge Health Oshawa Ontario Canada
5. Department of Pediatrics Queen's University Kingston Ontario Canada