Contribution to authorship
SW, MW, YC and KY conceived the idea and the study design. QZ, WT, DC
and LX performed statistical analysis. YC, KY, QZ and WT wrote the
manuscript with revisions and corrections provided by SW, MW, JZ, SZ,
JD, YJ. All authors contributed to the interpretation of the findings,
critically reviewed the manuscript, and approved the final manuscript
version.