Contribution to authorship
YW and HYZ contributed to planning the review, screening all titles and
abstracts, reviewing full articles, and performing data extraction. FZ
was a third reviewer in case where there were inconsistencies. YW
performed the data analysis and drafted the initial manuscript. JL
assisted with the study design and data analysis. FZ contributed to
interpreting the data and revising the manuscript. All authors approved
the final version of this manuscript.