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 - MRC Clinical Trials Unit, 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