Funding for this research was provided by:
National Research Council of Thailand (61003202)
Text and Data Mining valid from 2020-03-29
Received: 16 October 2019
Accepted: 27 February 2020
First Online: 29 March 2020
Ethics approval and consent to participate
: Ethics approval was granted by Khon Kaen University Ethics Committee for human research and the need for a consent was waived by the ethics committee, based on the declaration of Helsinki (Reference number: HE592265).
: Not applicable.
: Authors declare no potential conflict of interest related to this study.