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Contributors The three authors substantially contributed to the conception or design of the work, the acquisition, analysis and interpretation of data for the work; PVE drafted the work; THLJ and RAG revised it critically for important intellectual content; and finally approved the version to be published; and agreed 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 None declared.
Provenance and peer review Not commissioned; externally peer reviewed.