Funding for this research was provided by:
National Natural Science Foundation of China (81660332)
Natural Science Foundation of Jiangxi Province (20151BAB205057)
Health and Family Planning Project of Jiangxi Province (20155634)
Article History
Received: 6 December 2019
Accepted: 8 June 2020
First Online: 15 June 2020
Compliance with Ethical Standards
:
: The authors declare that they have no competing interests.