Funding for this research was provided by:
National Natural Science Foundation of China (81500041)
Education Department of Hunan Province (2016-400-744)
Text and Data Mining valid from 2018-08-02
Received: 9 April 2018
Accepted: 25 July 2018
First Online: 2 August 2018
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board at the Hospital Affiliated with Xiangnan University School of Medicine in the form of modified teaching method study. Considering the nature of the study, written consent from each individual participating in the study was waived by the IRB.
: Since this was a teaching method study without patients involved, consent to publish was waived by the institutional review board.
: The authors declare that they have no competing interests.
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