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Text and Data Mining valid from 2020-07-29
Version of Record valid from 2020-07-29
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Article History
Received: 28 May 2020
Accepted: 20 July 2020
First Online: 29 July 2020
Ethics approval and consent to participate
: This study was approved by the biomedical research ethics committee of Peking University First Hospital (approval No. 2018, scientific research 242), and the need for informed consent was waived.
: Not applicable.
: The authors declare that they have no competing interests.
