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Contributors OM performed the drafting of the manuscript. Critical revision of the manuscript for important intellectual content was done by NS, SG, WAvH, TEK and MJB. Original concept, manuscript supervision and approval was provided by MJB.
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 and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting or dissemination plans of this research.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
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