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Authors
Ao, Shuang
Liu, Yu
Wang, Yu
Zhang, Hao
Leng, Hui
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Article History
Received: 7 July 2019
Accepted: 29 August 2019
First Online: 15 October 2019
Ethics approval and consent to participate
: This study was approved by the Chifeng Municipal Hospital Institutional Review Board, and informed consent was waived due to the retrospective nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.
