1. Hospital for Tropical Diseases, University College Hospital, London
2. London School of Hygiene and Tropical Medicine, London
3. University College Hospital, London
4. Department of Molecular Neuroscience, MRC Centre for Neuromuscular Disease, UCL Institute of Neurology, Queen Square, London
5. Academic Neuroradiological Unit, Department of Brain Repair and Rehabilitation, UCL Institute of Neurology, London, UK