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Contributors WW responsible for conceptualisation, data collection and manuscript drafting. MB responsible for data collection, neuroradiology and manuscript editing. RT responsible for critical review and manuscript editing.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Not commissioned; externally reviewed by Geraint Fuller, Gloucester, UK.