1. Centre for Infectious Medicine, Department of Medicine, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden;
2. Childhood Cancer Research Unit, Department of Women's and Children's Health, Karolinska Institutet, Karolinska University Hospital Solna, Stockholm, Sweden;
3. Clinical Genetics Unit, Department of Molecular Medicine and Surgery, and Center for Molecular Medicine, Karolinska Institutet, Karolinska University Hospital Solna, Stockholm, Sweden;
4. Department of Pediatrics, Faculty of Medicine, Kuwait University, Kuwait City, Kuwait;
5. Department of Women's and Children's Health, Uppsala University, Uppsala, Sweden;
6. Immunology Laboratory, Great Ormond Street Hospital, London, United Kingdom;
7. Department of Pediatrics, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark;
8. Department of Women's and Children's Health, University of Gothenburg, The Queen Silvia Children's Hospital, Gothenburg, Sweden;
9. Division of Hematology, Department of Medicine, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden;
10. Aga Khan University, Karachi, Pakistan;
11. Hospital for Sick Children, Toronto, ON;
12. Sheffield Children's Hospital, Sheffield, United Kingdom;
13. Division of Pediatric Hematology-Oncology, Hospital Infantil Universitario Niño Jesús, Madrid, Spain;
14. Division of Pediatric Hematology-Oncology, Department of Pediatrics, Erciyes University, Kayseri, Turkey;
15. Division of Pediatric Hematology, Hacettepe University, Ankara, Turkey;
16. Departments of Pediatrics and of Clinical Science Intervention and Technology, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden; and
17. Broegelmann Research Laboratory, The Gades Institute, University of Bergen, Bergen, Norway