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Contributors All authors contributed to the inception of the research idea. MJT, MCM and MKB performed the independent data extraction. WG provided oversight to the data extraction and associated disputes. MJT, WG and MCM performed the statistical analysis with oversight from PC and MB. All authors contributed to drafting / review of manuscript. MKB = Matthew K Bagg; MB = Max K Bulsara
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 Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
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