Funding for this research was provided by:
National Natural Science Foundation of China (81671330)
Science and Technology Department of Henan Province (201702131)
High Scientific and Technological Research Fund of Xinxiang Medical University (2017ZDCG-04)
Fundamental and Advancing Foundation of Henan Province (132300413216)
Training plan for young excellent teachers in Colleges and Universities of Henan (NO.2016GGJS-106)
Science and technology project of Xinxiang (CXGG17030)
Received: 4 February 2019
Accepted: 11 June 2019
First Online: 17 June 2019
Ethics approval and consent to participate
: The study protocol was approved by the ethics committee of the Second Affiliated Hospital of Xinxiang Medical University. All participants provided written informed consents before any study-related procedures were performed.
: Not applicable.
: The authors declare that they have no competing interests.