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Correction notice This paper has been updated since first published. In Table 1, Column 'Mortality', data value 0.195 has been revised to 0.195%.
Contributors The article was conceived, written, redrafted and agreed by both authors.
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.