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Contributors LP conceived the concept and wrote the first draft. SB provided data input. Both authors reviewed and critically appraised the manuscript.
Funding LP is supported in her work at the UCL Queen Square Institute of Neurology and National Hospital for Neurology and Neurosurgery, Queen Square, by a CARA-UCL Academic Sanctuary Fellowship.
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Competing interests None declared.
Provenance and peer review Not commissioned. Externally peer reviewed by Colin Mumford, Edinburgh, UK, and David Breen, Edinburgh, UK.