Funding for this research was provided by:
Foundation of Liaoning Province Education Administration (L2015564)
Shenyang Science and Technology Bureau (F17-231-1-56)
Science and Technology Plan Project of Liaoning (AF-SOP-07-1.0-01)
Text and Data Mining valid from 2019-08-07
Received: 5 January 2019
Accepted: 29 July 2019
First Online: 7 August 2019
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of China Medical University (Shenyang, China, AF-SOP-07-1. 0–01). All procedures were performed in accordance with ethical standards. Written consent was obtained from all participants after they had been informed of the objectives, benefits, medical items, and confidentiality agreement regarding their personal information.
: Not applicable.
: The authors declare that they have no competing interests.