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Authors
Dong, Changqing
Liu, Shengmao
Li, Yanling
Cui, Yingchun
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Article History
Received: 12 March 2020
Accepted: 28 April 2020
First Online: 7 May 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the Ethics Committee of Shaanxi Provincial People’s Hospital. All procedures performed in studies involving human participants were in accordance with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. All patients signed the informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
