Funding for this research was provided by:
National Natural Science Foundation of China (Grant No. 81702780)
Received: 20 September 2018
Accepted: 6 February 2019
First Online: 13 February 2019
Ethics approval and consent to participate
: The present study was approved by the Ethics Committee of the First Affiliated Hospital of Zhengzhou University.
: Not applicable.
: The authors declare that they have no competing interests.
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