Wang, Shuaichao
Shi, Xingjie
Wu, Mengyun
Ma, Shuangge
Funding for this research was provided by:
National Natural Science Foundation of China (71331006, 91546202)
National Bureau of Statistics of China (2018LD02)
U.S. Department of Health & Human Services | National Institutes of Health (CA216017, CA204120)
Article History
Received: 20 February 2019
Accepted: 30 August 2019
First Online: 17 September 2019
Competing Interests
: The authors declare no competing interests.