Funding for this research was provided by:
National Natural Science Foundation of China (81625014)
Text and Data Mining valid from 2018-04-10
Received: 21 December 2017
Accepted: 3 April 2018
First Online: 10 April 2018
Ethics approval and consent to participate
: In this study, patient sampling and data collection were approved by the research ethics board at Peking University People’s Hospital. Participants consent was not necessary as this study was retrospective and participants were anonymized.
: The authors declare that they have no competing interests.
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