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Contributors CH, MBW, PS and AR: substantial contributions to the conception or design of the work, or the acquisition, analysis or interpretation of data; final approval of the version published. All authors: drafting the work or revising it critically for important intellectual content; agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
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 CH, AR and MBW: consultancy for Medtronic.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; internally peer reviewed.
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