Article Text
Letter
Reply to Dr. Wang et al
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Footnotes
Contributors YT: Writing the paper; YI: Writing the paper; TF: Writing the paper.
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; internally peer reviewed.