Funding for this research was provided by:
Rajamangala University of Technology Rattanakosin, Wang Klai Kangwon Campus (A-51/2561)
Text and Data Mining valid from 2020-02-28
Received: 6 November 2019
Accepted: 18 February 2020
First Online: 28 February 2020
: The authors declare that they have no competing interests.