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.