Funding for this research was provided by:
National Research Council of Thailand (No. 21/2562)
Received: 3 February 2020
Accepted: 2 July 2020
First Online: 10 July 2020
Ethics approval and consent to participate
: All research protocols and tools were approved by the Chiang Rai Provincial Public Health Research Ethical Committee (No. CRPPHO 17/2562). All participants were asked to obtain written informed consent form after oral explanation on all essential information of the study, before starting of data collection.
: Not applicable.
: The authors declare that they have no competing interests.