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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
Competing interests None declared.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
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