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Contributors ZL and YG replied to the comment. YG wrote the draft of the letter. All authors contributed to the writing, review or revision of the paper. They also read and approved the final manuscript. ZL is the guarantor of this work and, as such, had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Competing interests None.
Provenance and peer review Not commissioned; internally peer reviewed.