Funding for this research was provided by:
National Natural Science Foundation of China (81300693, 81571385)
the Research Special Fund for Public Welfare Industry of Health (201302008)
Text and Data Mining valid from 2019-03-05
Received: 6 July 2017
Accepted: 27 February 2019
First Online: 5 March 2019
Ethics approval and consent to participate
: The Biomedical Ethics Committee of Beijing Hospital approved the study. Written, informed consent was obtained for all participants prior to the assessments.
: Not applicable.
: The authors declare that they have no competing interests.
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