Contribution to authorship
JT and QZ contributed to the project design and manage the data
resource. XZ, ML, DH cleaned the data and JT performed the statistical
analysis. JT and WB drafted the manuscript and interpreted the data. TH
and RC interpreted the data and provided reviews, QZ administrated this
study. JT, XZ, DH, ML, WB, RC, TH and QZ have approved the version for
publication.