1. Department of Hematology, San Bortolo Hospital, Vicenza, Italy;
2. Department of Medical Sciences, Ospedale Regina Apostolorum, Albano Laziale, Italy;
3. Puget Sound Blood Center, University of Washington School of Medicine, Seattle;
4. Université Paris 12, Faculté de Medecine, Assistance Publique-Hôpitaux de Paris (AP-HP), Hopital Henri Mondor, Service de Medecine Interne, Créteil, France;
5. Department of Haematology, Barts and The London School of Medicine and Dentistry, London, United Kingdom;
6. Department of Medicine, Michael G. DeGroote School of Medicine, McMaster University, Hamilton, ON;
7. Weill Cornell Medical College of Cornell University, New York, NY;
8. Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia;
9. Department of Hematology, St George Hospital, South Eastern Area Laboratory Service, and Department of Medicine, St George Clinical School, University of New South Wales, Sydney, Australia;
10. Molecular Immunology Unit, Institute of Child Health, London, United Kingdom;
11. Department of Internal Medicine I, Division of Haematology and Haemostaseology, Medical University of Vienna, Vienna, Austria;
12. Department of Cellular Biotechnology and Hematology, La Sapienza University, Rome, Italy;
13. Scripps Research Institute, La Jolla, CA;
14. Hematology Service, Hospital Universitario La Fe, Valencia, Spain;
15. Pediatric Oncology/Hematology, University Children's Hospital Basel, Basel, Switzerland;
16. Division of Hematology/Oncology, The Hospital for Sick Children, Department of Pediatrics, University of Toronto, Toronto, ON; and
17. Hematology-Oncology Section, College of Medicine, Department of Biostatistics and Epidemiology, College of Public Health, University of Oklahoma Health Sciences Center, Oklahoma City