Funding for this research was provided by:
the Bureau of Education of Jiangxi province (150972, GJJ13686)
Health Department of Jiangxi Provincial (20122032)
the Health and Family Planning Commission of Jiangxi Province (20175559)
Article History
Received: 6 December 2017
Accepted: 13 May 2018
First Online: 28 May 2018
Compliance with ethical standards
:
: None declared.