Text and Data Mining valid from 2018-04-19
Received: 27 December 2017
Accepted: 13 March 2018
First Online: 19 April 2018
Ethics approval and consent to participate
: This retrospective study was approved by the Institutional Review Board (IRB) of 301 and Peking University People’s hospitals. All patients involved in the study consented to participate in the study, and the written consent has been obtained from all the patients.
: All individual persons consented to publish their data.
: The authors declare that they have no competing interests.
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