Text and Data Mining valid from 2020-02-19
Received: 10 September 2018
Accepted: 20 January 2020
First Online: 19 February 2020
Ethics approval and consent to participate
: Ethical approval was given by the Ethics Committee of Shengjing Hospital of China Medical University, Shenyang, China.
: Not applicable.
: All the authors declare that they have no conflict of interest.