Footnotes

• Contributors MRT suggested the article. The manuscript was drafted by ALRR, with input and review by all authors.

• Funding There is no funding information to declare.

• Competing interests None declared.

• Patient consent for publication Not required.

• Provenance and peer review Not commissioned. Externally peer reviewed by Andrew Chancellor, Tauranga, New Zealand.

  I, the Submitting Author has the right to grant and does grant on behalf of all authors of the Work (as defined in the below author licence), an exclusive licence and/or a non-exclusive licence for contributions from authors who are: i) UK Crown employees; ii) where BMJ has agreed a CC-BY licence shall apply, and/or iii) in accordance with the terms applicable for US Federal Government officers or employees acting as part of their official duties; on a worldwide, perpetual, irrevocable, royalty-free basis to BMJ Publishing Group Ltd (‘BMJ’) its licensees and where the relevant Journal is co-owned by BMJ to the co-owners of the Journal, to publish the Work in Practical Neurology and any other BMJ products and to exploit all rights, as set out in our licence.