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Authors
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Liu, Chang-Yuan
Zhang, Wei
Ji, Li-Nong
Wang, Ji-Guang
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Article History
Received: 7 June 2019
Accepted: 14 August 2019
First Online: 23 August 2019
Ethics approval and consent to participate
: The ethics committees of all participating hospitals approved the study protocol. All subjects gave written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
