Funding for this research was provided by:
National Natural Science Foundation of China (81871373)
Support Programs for Young Scientific and Technological Innovation Talents of Shenyang (RC170557)
Youth Project of Basic Scientific Research for Colleges and Universities in Liaoning Province (LQNK201701)
Text and Data Mining valid from 2020-02-13
Received: 3 October 2019
Accepted: 7 February 2020
First Online: 13 February 2020
Ethics approval and consent to participate
: The study protocol was approved by the China Medical University Ethics Committee and was conducted in accordance with the ethical guidelines of the 1975 Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.