Funding for this research was provided by:
Natural Science Foundation of Liaoning Province (201602822)
National Key R&D Program of China (No.2017YFC0908300)
Text and Data Mining valid from 2019-07-04
Received: 9 May 2018
Accepted: 17 June 2019
First Online: 4 July 2019
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of Chinese Medical University and all participants signed an informed consent.
: Not applicable.
: The authors declare that they have no competing interests.