University of Liverpool - Institute of Infection, Veterinary and Ecological Sciences, Great Ormond Street - Department of Paediatric Neurology, Guy's and St Thomas' NHS Foundation Trust - Evelina London Children's Hospital, Leeds Teaching Hospitals NHS Trust, University of Liverpool - Institute of Infection and Global Health, Leeds Teaching Hospitals NHS Trust, Government of the United Kingdom - Barts Health NHS Trust, Oxford Children’s Hospital - Paediatric Neurology Department, Leeds Teaching Hospitals NHS Trust, Leeds Community Healthcare Trust - Child and Adolescent Mental Health Services, Leeds Community Healthcare Trust - Child and Adolescent Mental Health Services, Newcastle University, Leeds Teaching Hospitals NHS Trust, University of Southampton - Southampton Children’s Hospital, University of Southampton - Southampton Children’s Hospital, Oxford Children’s Hospital - Paediatric Neurology Department, Nottingham Children's Hospital, Nottingham Children's Hospital, Royal Hospital for Children, Royal Hospital for Children, Birmingham Children’s Hospital - Department of Neurology, Birmingham Children's Hospital - Department of Neurology, University of Newcastle - Newcastle University Translational and Clinical Research Institute, Northumbria Healthcare NHS Foundation Trust, University Hospital London - Paediatrics Department, Government of the United Kingdom - Chelsea and Westminster Hospital NHS Foundation Trust, Imperial College London, Royal Manchester Children’s Hospital - Department of Neurology, Royal Manchester Children’s Hospital - Department of Neurology, Royal Manchester Children’s Hospital - Department of Neurology, Alder Hey Children's NHS Foundation Trust, King’s College London - Institute of Psychiatry, Psychology & Neuroscience (IoPPN), Great Ormond Street Hospital for Children, Great Ormond Street Hospital - Department of Paediatric Infectious Diseases, University of Southampton - University Hospital Southampton NHS Foundation Trust, Alder Hey Children's NHS Foundation Trust, Alder Hey Children's NHS Foundation Trust, University College London, Clinical Neurosciences, Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, UK, Newcastle University, Guy's and St Thomas' NHS Foundation Trust - Children's Neuroscience Centre, Great Ormond Street - Department of Paediatric Neurology, University of Liverpool - Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool - Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool - Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool - Institute of Infection, Veterinary and Ecological Sciences and Independent