Funding for this research was provided by:
National Office for Philosophy and Social Sciences (16BSH096)
Article History
Received: 30 May 2019
Accepted: 17 October 2019
First Online: 25 November 2019
Compliance with ethical standards
: This study was approved by the Ethics Committee of the Third Military Medical University (approval no. S-16096).
: The authors declare that they have no conflict of interest.