Funding for this research was provided by:
Office of the Higher Education Commission (022/2012)
National Research Council of Thailand (year 2014)
Graduate School of Prince of Songkla University (year 2011)
Article History
Received: 30 November 2018
Accepted: 1 March 2019
First Online: 14 March 2019
Compliance with Ethical Standards
: This study was funded by Strategic Scholarships of Frontier Research Network (Specific for the Southern region), the Office of the Higher Education Commission (Grant no. 022/2012), National Research Council of Thailand (Grant year 2014), and the Graduate School of Prince of Songkla University.
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: Informed consent was obtained from all individual participants of this study.