Funding for this research was provided by:
National Natural Science Foundation of China (51471186)
Text and Data Mining valid from 2019-03-05
Received: 6 March 2018
Accepted: 25 February 2019
First Online: 5 March 2019
Ethics approval and consent to participate
: All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional (Chinese PLA General Hospital) and/or national research committee and with the 1964 Helsinki declaration and its later amendments. Since this is a retrospective statistical analysis based on electronic health records collected as part of standard healthcare, without disclosing the patients’ identity, no individual patients were directly contacted for the data. The need of consent was waived by the institutional ethical committee of the Chinese PLA General Hospital.
: Not applicable.
: The authors declare that they have no competing interests.
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