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Contributors TT: literature search, drafting and critical revision of the manuscript. JM: image selection, critical revision of the manuscript. SA: image selection, critical revision of the manuscript. US: study concept and design, literature search, critical revision of the manuscript.
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 US has received travel and speaker honoraria from Eisai Australia and LivaNova Australia.
Provenance and peer review Not commissioned; externally peer reviewed by Iain McGurgan, Oxford, UK.