Funding for this research was provided by:
National Natural Science Foundation of China (81670381 and 81400710)
Text and Data Mining valid from 2019-04-08
Received: 20 July 2018
Accepted: 18 March 2019
First Online: 8 April 2019
Ethics approval and consent to participate
: Ethical approval was obtained from the Fourth Affiliated Hospital of Harbin Medical University Research Ethics Committee (2018-SCILLSC-01).
: Not applicable.
: The authors declare that they have no competing interests.
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