1. Department of Pediatrics; Section of Hematology/Oncology and the Hemophilia and Thrombosis Center; University of Colorado School of Medicine and Children's Hospital Colorado; Aurora CO USA
2. Division of Hematology; CHOC Children's Specialists; Orange CA USA
3. Department of Pediatrics; Division of Hematology; The Children's Hospital of Philadelphia; University of Pennsylvania School of Medicine; Philadelphia PA USA
4. Department of Haematology; Royal Hospital for Sick Children; Yorkhill Glasgow UK
5. Department of Pediatric Haematology; Emma Children's Hospital/Academic Medical Centre; Amsterdam the Netherlands
6. Division of Hematology/Oncology; Department of Pediatrics; McMaster University; Hamilton ON Canada
7. Division of Hematology; Department of Pediatrics; Johns Hopkins University School of Medicine; Baltimore MD USA
8. Johns Hopkins Medicine Pediatric Thrombosis Program; Johns Hopkins All Children's Hospital; St. Petersburg FL USA
9. Johns Hopkins Children's Center; Baltimore MD USA
10. All Children's Research Institute; Johns Hopkins All Children's Hospital; St. Petersburg FL USA