Funding for this research was provided by:
Natural Science Foundation of Beijing Municipality (7152146)
Collaborative Research Foundation of Peking University Health Science Center and National Taiwan University, College of Medicine (BMU20120318)
the Clinical Features Research of Capital (No.Z151100004015173)
Text and Data Mining valid from 2018-04-10
Received: 11 October 2016
Accepted: 13 March 2018
First Online: 10 April 2018
: The authors declare that they have no competing interests.
: Not applicable.
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