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Authors
Zhang, Xianwen
Zheng, Liaoyuan
Duan, Jingfeng
Li, Zongping
Tang, Yufeng
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Article History
Received: 12 May 2020
Accepted: 13 November 2020
First Online: 30 December 2020
Ethics approval and consent to participate
: This retrospective study was approved by the Mianyang Central Hospital Research Ethics Board and they decided that the written informed consent was not necessary.
: Not applicable.
: The authors declare that they have no competing interests.
