1. Institute of Immunity and Transplantation, University College London, London, United Kingdom;
2. Department of Immunology and
3. Department of Haematology, Royal Free London NHS Foundation Trust, London, United Kingdom;
4. Cancer Institute, University College London, London, United Kingdom;
5. Institute of Child Health, University College London, London, United Kingdom;
6. Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom;
7. Centre for Nephrology, University College London, London, United Kingdom;
8. Department of Histopathology, Royal Free London NHS Foundation Trust, London, United Kingdom;
9. Genethon, Evry, France; and
10. Department of Microbiology, University of Pennsylvania School of Medicine, Philadelphia, PA