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Authors
Ji, Chengyue
Yu, Shunzhi
Yan, Ning
Wang, Jiaxing
Hou, Fang
Hou, Tiesheng
Cai, Weihua
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Article History
Received: 19 September 2019
Accepted: 30 December 2019
First Online: 14 January 2020
Competing interest
: The authors declare that they have no competing interest.
: Our retrospective study received Institutional Review Board approval and written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.
