1. Department of Haematology; The Newcastle upon Tyne Hospitals NHS Foundation Trust; Newcastle upon Tyne UK
2. Carman and Ann Adams Department of Pediatrics; Division of Hematology Oncology; Wayne State University School of Medicine; Children's Hospital of Michigan; Detroit MI USA
3. Division of Pediatric Hematology/Oncology; Hospital for Sick Children; Toronto Ontario Canada
4. Department of Pediatric Hematology; Erasmus Medical Center Sophia Children's Hospital; Rotterdam the Netherlands
5. McMaster Children's Hospital; McMaster University; Hamilton Ontario Canada
6. Division of Hematology; Department of Pediatrics; Johns Hopkins University School of Medicine; Baltimore MD USA
7. Johns Hopkins Medicine Pediatric Thrombosis Program; Johns Hopkins All Children's Hospital; St Petersburg FL USA
8. Johns Hopkins Children's Center; Baltimore MD USA