Pei, Xiaoting
Liu, Li
Imam, Mustapha Umar
Lu, Ming
Chen, Yanzi
Sun, Panpan
Guo, Yaxin
Xu, Yiping
Ping, Zhiguang https://orcid.org/0000-0001-8924-0761
Fu, Xiaoli
Funding for this research was provided by:
National Natural Science Foundation of China (81001280)
National Natural Science Foundation of China (81202277)
National Natural Science Foundation of China (81373096)
Key Research Project for Colleges and Universities in Henan Province (16A330003)
Article History
Received: 20 November 2017
Accepted: 12 April 2018
First Online: 20 April 2018
Ethics approval and consent to participate
: The protocol for the study was approved by the ethics committee of Zhengzhou University, and written consents were obtained from all the participants.
: The authors declare that they have no competing interests.
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