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Authors
Wang, Haiyan
Xie, Yun
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Article History
Received: 7 May 2019
Accepted: 11 September 2019
First Online: 6 January 2020
Compliance with Ethical Standards
: Our study was approved by the Ethics Board of Affiliated Hospital of Qinghai University and was performed in accordance with the principles of the Declaration of Helsinki.
: The authors declare that they have no conflict of interest.
: The project was supported by Natural Science Basic research Plan in Shaanxi Province of China (2016JQ8058).
