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Contributors Both authors conceived the study idea. LI wrote the initial draft. Both authors revised the draft and approved the final version.
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 No financial competing interests, however, both authors have been involved in several of the original studies cited in this editorial.
Provenance and peer review Not commissioned; externally peer reviewed.
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