Author contributions
WL
XP and SS had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: XP, SS, WL. Acquisition, analysis, or interpretation of data: SS. Drafting of the manuscript: XP, JX. Critical revision of the manuscript for important intellectual content: SS, LZ, SZ, and XW. Statistical analysis: XP and SS. All authors read and approved the final manuscript.
