Text and Data Mining valid from 2019-05-16
Received: 22 February 2019
Accepted: 9 April 2019
First Online: 16 May 2019
Ethics approval and consent to participate
: This study was approved by the Medical Ethics Committee of Peking University First Hospital. Written informed consent to participate was obtained from all patients for being included in the study on behalf of the patients.
: Not application.
: The authors declare that they have no competing interests.
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