Liang, Yun
Hu, Xingsheng
Li, Xiaoqin
Wen, Bing
Wang, Liang
Wang, Cheng http://orcid.org/0000-0002-0012-0921
Funding for this research was provided by:
This work was supported by the Sichuan provincial health and family planning commission funds (grant numbers 16PJ126).
Article History
Received: 17 October 2019
Accepted: 14 February 2020
First Online: 3 March 2020
Competing interests
: The authors declare no competing interests.