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Twitter @DrVickiCurrie1, @andrewjtagg, @DrKanaris
Contributors VC produced initial piece of work based on a literature search by CK. CK, AT and VC edited work to produce final article.
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 peer reviewed.