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Authors
Yu, Ge
Ji, Huaijun http://orcid.org/0000-0002-3737-4810
Meng, Chuizheng
Huang, Yixuan
Gao, Guogang
Liu, Chuanping
Wang, Shanlei
Zhang, Lei
Ju, Jin
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Article History
Received: 13 April 2019
Accepted: 17 June 2019
First Online: 28 June 2019
Ethics approval and consent to participate
: This retrospective study was approved by the Institutional Review Board (IRB) of the Weihai Municipal Hospital, and permission was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.
