Author contributions
Study concept and design was performed by XC, FL, GG and AA. Analysis
and interpretation of data were performed by AA, GG, CC, ZG, JY, TZ, ZZ.
Administrative, technical, or material support was performed by XC and
FL. Study supervision was performed by XC. The first draft of the
manuscript was written by XC, AA, GG, CC, and XC, and all authors
commented on.