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Authors
Wang, Xiaofeng http://orcid.org/0000-0002-6087-1444
Nie, Fang
Ye, Na
Liu, Xuehui
Yang, Shaoqing
Guo, Fangzhou
Li, Jing
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Article History
Received: 24 April 2019
Accepted: 24 June 2019
First Online: 5 July 2019
Ethics approval and consent to participate
: Ethics approval for the study was given by Second Hospital of the Lanzhou University in Gansu.
: Not applicable.
: The authors declare that they have no conflicts of interest concerning this article.
