Contribution to Authorship
D.Z. conducted data analysis and drafting the article. Z.Z. have drafted
and revised the article. H.W. conducted the organization and
implementation of project as secretary and participated in the
investigation of Beijing. R.L. contributed to the acquisition of
Beijing’s data, and revising the article for important intellectual
content. S.X., Y.K., Y.C., X.C., Y.Z., S.X. and Z.C. did the specific
data interpretation of Hebei, Fujian, Anhui, Nei Mongol, Zhejiang,
Heilongjiang and Shandong provinces, respectively. J.Q. contributed to
conception and design, final approval of the version to be published as
corresponding author.