1 Yale University School of Medicine, New Haven, CT, USA.
2 Icahn School of Medicine at Mount Sinai, New York, NY, USA.
3 The Genetics Institute, Rambam Health Care Campus, The Ruth and Bruce Rappaport Faculty of Medicine, Technion, - Israel Institute of Technology, Haifa, Israel.
4 Hôpital La Rabta, Tunis, Tunisia.
5 College of Medicine, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA.
6 Northwestern University Feinberg School of Medicine, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois, USA.
14 University Hospital Alexandrovska, Sofia, Bulgaria.
15 Duke University School of Medicine, Department of Pediatrics, Durham, NC, USA.
16 National Research Center for Hematology, Moscow, Russia.
17 Bichat University Hospital, Paris, France.
18 Universidade Federal de São Paulo, São Paulo, SP, Brazil.
19 New York University School of Medicine, New York, NY, USA.
20 Clinical Center of Serbia, University of Belgrade School of Medicine, Belgrade, Serbia.
21 Rambam Medical Center, Haifa, Israel.
22 Cedars-Sinai, Tower Hematology Oncology, Beverly Hills, CA, USA.
23 University of Cambridge, Department of Medicine, Box 157, Level 5, Addenbrooke's Hospital, Cambridge CB2 0QQ, UK. Electronic address: tmc12@medschl.cam.ac.uk.