1. Department of Clinical Neurosciences, University College London Institute of Neurology
2. Molecular and Genetics Unit, University College London Institute of Child Health
3. Enzyme Unit and Metabolic Unit, Chemical Pathology, Great Ormond Street Hospital
4. Reta Lila Weston Research Laboratories, Departments of Molecular Neuroscience and Clinical Neuroscience, University College London Institute of Neurology
5. Department of Molecular Neuroscience, University College London Institute of Neurology, London, United Kingdom