Funding for this research was provided by:
Royal Golden Jubilee (RGJ) Ph.D. Programme (PHD/0081/2558)
Khon Kaen University (61004602, 620008003)
Received: 11 December 2019
Accepted: 18 June 2020
First Online: 24 June 2020
Ethics approval and consent to participate
: The study was approved by the Khon Kaen University ethics committee in human research (HE611288).
: Not applicable.
: The authors declare that they have no competing interests.