Authors’ contributions
YY, XL, GL and XH are responsible for the idea, design and conduct of the research. XL and GL contributed to the acquisition and interpretation of data. YY and XL contributed to the statistical analysis. YY and XL wrote the original draft. XH and GL supervised this study. All authors substantively edited and revised the manuscript critically. YY and XL contributed equally to this study. All authors have contributed, read, and approved to the final version of the manuscript.