Funding for this research was provided by:
National Natural Science Foundation of China (81602108)
Provincial Teaching Research Project in Hubei (2014230)
Text and Data Mining valid from 2018-08-02
Received: 28 January 2018
Accepted: 19 July 2018
First Online: 2 August 2018
Ethics approval and consent to participate
: Approval was obtained from the Ethics Committee of Medicine College, Wuhan University of Science and Technology. Written informed consent was also obtained from the students.
: Not applicable.
: The authors declare that they have no competing interests.
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