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Contributors I can confirm that all authors made substantial contributions to the conception and design of this paper. It was drafted and revised by all authors each of whom has approved the submitted version. All authors agree to be accountable for all aspects of the work and 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 None declared.
Patient consent Not required.
Provenance and peer review Commissioned; internally peer reviewed.
Data sharing statement There are no data to share relevant to this manuscript.
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