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Contributors BM wrote the first draft and performed a literature search. PF conceived the idea, provided the neuroimaging figures and revised previous drafts. PJK provided neuroimaging and revised drafts of the paper. FM helped write the paper and revise previous drafts. MOM had the idea of writing the paper, performed a literature search, helped write the first draft and subsequent reviews.
Competing interests None declared.
Patient consent Obtained.
Provenance and peer review Not commissioned; externally peer reviewed. This paper was reviewed by Martin Punter, Salford, UK.