1. Division of Research Haematology; Department of Pediatrics; Marian Anderson Comprehensive Sickle Cell Anaemia Care and Research Centre; Jefferson Medical College; Thomas Jefferson University; Philadelphia; PA; USA
2. Department of Medicine; University of North Carolina at Chapel Hill; Chapel Hill; NC; USA
3. Sol Sherry Thrombosis Research Centre,; Temple University School of Medicine; Philadelphia; PA; USA
4. AFLAC Cancer and Blood Disorders Program; Emory University School of Medicine and Children's Healthcare of Atlanta; Atlanta; GA; USA