Article Text
Letter
Response to Fu-Shan Xue’s letter to the editor
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Footnotes
Contributors All authors were responsible for the writing of the letter to the editor and approved the final letter.
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.
Provenance and peer review Not commissioned; externally peer reviewed.