1 Department of Immunology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, UK; Department of Paediatric Haematology, Oncology and Immunodeficiencies, Justus, Liebig-University, Giessen, Germany. Electronic address: andrea.meinhardt@paediat.med.uni-giessen.de.
2 Department of Immunology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, UK; Department of Paediatric Infectious Diseases and Immunology, Royal Hospital for Children, Glasgow, UK.
3 Department of Neurology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, UK.
4 Department of Neurology, St George's University Hospital NHS Foundation Trust, London, UK.
5 Paediatric Immunology, Leeds Children`s Hospital, Leeds, UK; Paediatric Haematology-Oncology Stem Cell Transplant Department at NBK Children's Hospital, Kuwait.
6 Department of Neuropathology, Kings College Hospital NHS Foundation Trust, London, UK.
7 Department of Immunology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, UK; Department of Infection, Immunity and Inflammation, UCL Great Ormond Street Institute of Child Health, London, UK.
8 Paediatric Infectious Disease and Immunology, University Hospital of Wales, Cardiff, UK.
9 Paediatric Infectious Disease and Immunology, St George's University Hospitals, NHS Foundation Trust, London, UK.
10 Public Health Wales Microbiology, Public Health Wales NHS Trust, Cardiff, UK.
11 Department of Neurology, King's College Hospital, London, UK.
12 Faculty of Medicine and Health Technology, Tampere University, Finland; Fimlab Laboratories, Tampere, Finland.
13 Faculty of Medicine and Health Technology, Tampere University, Finland.
14 Institute of Immunity and Transplantation, University College London, London, UK.
15 Department of Neuromuscular Diseases, UCL Queen Square Institute of Neurology, London, UK.
16 Department of Radiology, Great Ormond Street Hospital NHS Foundation Trust, London, UK.
17 Department of Paediatric Infectious Diseases, St Mary's Hospital, Imperial College NHS Healthcare Trust, London, UK; Department of Academic Paediatrics, Imperial College, 2nd Floor Wright-Fleming Building, London, UK.
18 Department of Immunology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, UK.
19 Department of Infection, Immunity and Inflammation, UCL Great Ormond Street Institute of Child Health, London, UK; Department of Infectious Diseases, Great Ormond Street Hospital for Children NHS Foundation Trust, London, UK.