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Contributors PJM contributed with conception and design of the manuscript, acquisition of data and review of the relevant literature. SMM contributed with the design of the manuscript, editing of the manuscript and review of the relevant literature. MDA, LC, JMM, AMT and RD contributed with the editing 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 None declared.
Patient consent for publication Obtained.
Provenance and peer review Not commissioned; externally peer reviewed by Michael Lunn, London, UK.
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