Funding for this research was provided by:
National Natural Science Foundation of China (8150120621)
Received: 15 May 2018
Accepted: 4 July 2018
First Online: 28 July 2018
Ethics approval and consent to participate
: Informed consent was obtained from all individual participants included in the study, and the study was approved by the Ethics Committees of Zhengzhou University.
: All the authors provided written informed consent for the publication of the results of this study.
: The authors declare that they have no competing interests.
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