Funding for this research was provided by:
National Research Council of Thailand (Grant no. 60207020106)
Text and Data Mining valid from 2019-08-14
Received: 22 January 2019
Accepted: 8 August 2019
First Online: 14 August 2019
Ethics approval and consent to participate
: All research proposal, protocol and consent to participate were approved by the Mae Fah Luang University Research Ethics Committee on Human Research (REH-60030). Interview for data collection and drawing blood specimen for laboratory testing were conducted after all participants received oral and written explanation regarding the study objectives and procedures including any possible risk for physical and mental harms, and obtaining their voluntary agreement by signing on the consent form. The parental consent was obtained from the parent/guardian for participants under 16 years old by written which was agreed by the ethic committee. After completion of the analysis, all completed questionnaires were destroyed properly. All relevant data files were kept with security passwords in a personal computer. A small gift was provided to all participants to appreciate their cooperation.
: Not applicable.
: The author declares that he has no competing interests.