Article Text
Letter
Reply to Drs Carella and Lecoq
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Footnotes
Contributors XR and JZ analyzed the data and wrote the letter. The authors read and approved the final 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 None declared.
Provenance and peer review Not commissioned; internally peer reviewed.