Author Contributions
M.Y.L, S.B.H and X.D designed
these experiments; M.Y.L and X.D performed the experiments and collected
the data in Chongqing, China; M.Y.L,
Y.J.Z and M.Q.G executed the data
analyses and finalized the figures; M.Y.L and S.B.H interpreted the
results, drafted and edited the manuscript. All authors contributed
towards editing and finalizing the manuscript.