Funding for this research was provided by:
the Scientific Research Program of Health and Family Planning Commission of Shanxi Province (No. 201602027)
the Start-up Fund Program for Doctor of Changzhi Medical College (No. BS15004)
Article History
Received: 7 June 2018
Accepted: 26 July 2018
First Online: 18 August 2018
Compliance with Ethical Standards
:
: The authors declare that they have no competing interests.
: Consent for publication was obtained from the participants.