Funding for this research was provided by:
Chinese national natural science foundation (81400923)
Beijing Municipal Administration of Hospitals’ Youth Programme (QML 20150405)
Key Project of Chinese National Programs (2016YFC0105800&2016YFC0105801)
Text and Data Mining valid from 2018-09-11
Received: 17 July 2017
Accepted: 16 August 2018
First Online: 11 September 2018
Ethics approval and consent to participate
: The study protocol was approved by the institutional review board and the ethics committee of the Beijing Jishuitan Hospital, Beijing, China.Written informed consent was obtained from each participant before the data was collected.
: Not applicable
: The authors declare that they have no competing interests.
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