Text and Data Mining valid from 2020-02-24
Received: 10 October 2019
Accepted: 4 February 2020
First Online: 24 February 2020
Ethics approval and consent to participate
: This retrospective study was approved by the Institutional Review Board (IRB) of 301 and Peking University People’s Hospital. All patients involved in the study consent to participate in the study. And the written consent has been obtained from all the patients.
: All individual person consented for their data to be published.
: The authors declare that they have no competing interests.