Affiliations: Charles Dent Metabolic Unit, 8-11 Queen Square, National Hospital for Neurology and Neurosurgery, London, WC1N 3BG, UK | Mark Holland Metabolic Unit, Salford Royal NHS Foundation Trust, Salford, Manchester, UK
Note: [] Correspondence to: Elaine Murphy, Charles Dent Metabolic Unit, National Hospital for Neurology and Neurosurgery, 8-11 Queen Square, London, WC1N 3BG, UK. E-mail: elaine.murphy@uclh.nhs.uk