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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.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
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