1. Department of Neurology, Great Ormond Street Hospital for Children, London, United Kingdom
2. Department of Neuroradiology, Great Ormond Street Hospital for Children, London, United Kingdom
3. UCL Great Ormond Street Institute of Child Health, Department of Infectious Disease, Great Ormond Street Hospital for Children, London, United Kingdom
4. UCL Great Ormond Street Institute of Child Health, Department of Neurology, Great Ormond Street Hospital for Children, London, United Kingdom
5. Queen Square Multiple Sclerosis Centre, UCL Institute of Neurology, Faculty of Brain Sciences, University College London, London, United Kingdom