Funding for this research was provided by:
Natural Science Foundation of Liaoning Province (No.2015020500)
Text and Data Mining valid from 2019-09-11
Received: 18 November 2018
Accepted: 30 August 2019
First Online: 11 September 2019
Ethics approval and consent to participate
: The study’s protocol was approved by China Medical University’s Research Ethics Committee, and all the study’s procedures were undertaken in accordance with the principles of the 1983 revision of the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.