Funding for this research was provided by:
Chosun University
Text and Data Mining valid from 2020-01-01
Version of Record valid from 2020-01-01
Article History
Received: 31 May 2019
Accepted: 19 November 2019
First Online: 1 January 2020
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.