Funding for this research was provided by:
the Youth Research Fund of Shanxi Province (201601D021169)
the Youth Research Fund of Shanxi Medical University (02201518)
the Doctoral Startup Research Fund of Shanxi Medical University (03201426)
Article History
Received: 10 June 2017
Accepted: 5 May 2019
First Online: 15 May 2019
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.