Authors’ contributions
LZ, HZ and YH conceived the idea. LJ, ZG and DW performed the
experiments. LJ, SY, CL and WD performed the statistical analyses. GZ,
YX, RW, GL and HW collected the samples. AZ, YH, HZ, LZ and TY wrote the
first draft of the manuscript. LJ, SY, CL, BL and L.Z. contributed
substantially to revisions. LJ, SY and CL equally contributed to this
work. All authors have read and approved the final manuscript.