Funding for this research was provided by:
National Natural Science Foundation of China (81541126)
National Natural Science Foundation of China (81071196)
Health Industry Special Scientiifc Reasearch Project (201402019)
Received: 31 August 2017
Accepted: 20 March 2018
First Online: 26 April 2018
Ethics approval and consent to participate
: The study has been approval by the Beijing AnZhen Hospital ethics review board in March 17, 2016. The design is reasonable, data collection standardized, the relevant rights and interests of the patients have been fully protected.
: The authors declare that they have no competing interests.
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