Foundation item:Supported by National Science Foundation of China(Grant 11601097);Zhejiang Provincial Natural Science Foundation of China(LY16A010001);Zhejiang Provincial Key Research Base for Humanities and Social Sciences Grant(statistics);Zhejiang Educational Committee(1020KZ0413455)
Supported by National Science Foundation of China(10801124,11171321,10801188);the Fundamental Research Funds for the Central Universities(WK2040170006)