Funding for this research was provided by:
China Medical University (YDJK2018008)
China Medical University (3110118063)
Department of Education of Liaoning Province (2018-387, LQNR201705)
Received: 9 February 2019
Accepted: 5 June 2019
First Online: 17 June 2019
Ethics approval and consent to participate
: All the subjects provided written informed consents and the study procedures were approved by the Institutional Review Board of China Medical University.
: Not applicable.
: The authors declare that they have no competing interests.