[Liu, Chengcheng] Beijing Normal Univ, Sch Social Dev & Publ Policy, Beijing 100875, Peoples R China.
[Zhang, Mingyu; Guo, Jing] Peking Univ, Sch Publ Hlth, Beijing 100191, Peoples R China.
[Ma, Chongyue] Henan Univ Econ & Law, Sch Accounting, Zhengzhou, Peoples R China.
[Fu, Mingqi] Huazhong Normal Univ, Sch Publ Management, Wuhan 430079, Peoples R China.
[Zhen, Cheng] Peking Univ Hlth Sci Ctr, Ctr Hist Med, Sch Hlth Humanities, Beijing, Peoples R China.