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Authors
Xu, Jun
Zhao, Meng
Li, Ji peng
Liu, Ning pu
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Article History
Received: 13 July 2019
Accepted: 6 April 2020
First Online: 15 April 2020
Ethics approval and consent to participate
: Ethical approval was given by the medical ethics committee of Beijing Tongren Hospital. It does not have reference number as a retrospective case series study.
: Not applicable.
: The authors declare that they have no competing interests.
