Funding for this research was provided by:
Thailand Research Fund (RSA6180058)
Received: 18 October 2019
Accepted: 4 December 2019
First Online: 16 December 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The Khon Kaen University Ethics Committee in human research approved this study. (Reference No. HE592019).