Funding for this research was provided by:
Tianjin Research Program of Application Foundation and Advanced Technology (15JCQNJC12000)
The Science &Technology Development Fund of Tianjin Education Commission for Higher Education (2017SK097)
The National Natural Science Fund (71673199)
Text and Data Mining valid from 2019-01-29
Received: 3 July 2018
Accepted: 17 January 2019
First Online: 29 January 2019
Ethics approval and consent to participate
: This study was approved by the Research Ethics Committees of Tianjin Medical University. Written consent from all participants was also obtained.
: Not applicable
: The authors declare that they have no competing interests.
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