Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Location of the four regional sites used in this study: Chiang Rai Province in the northern region, Nakorn Ratchasima Province in the northeastern region, Phitsanulok Province in the central region, and Surat Thani Province in the southern region.
