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Contributors YAT-W and JST developed the editorial idea. YAT-W composed the initial draft. All authors contributed to further content development, writing and final approval 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 YAT-W, PCZ and ST are associate editors of the BJSM. JST is an editor of the BJSM.
Provenance and peer review Not commissioned; externally peer reviewed.
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