Funding for this research was provided by:
National Natural Science Foundation of China (51771227)
National Key R&D Plan (2017YFC1104901)
Shaanxi Industrial Science and Technology Project (2016GY-198)
Text and Data Mining valid from 2018-08-28
Received: 15 March 2018
Accepted: 16 August 2018
First Online: 28 August 2018
Ethics approval and consent to participate
: All procedures of this study were in accordance with the ethical standards of the Medical Ethics Committee of Forth Military Medical University.
: Not applicable.
: The authors declare that they have no competing interests.
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