Witthayapipopsakul, Woranan, Yaowaluk Wanwong, Aniqa Islam Marshall, Somtanuek Chotchoungchatchai, Walaiporn Patcharanarumol, and Viroj Tangcharoensathien. “Effective Coverage and Its Application in the Thai Context”. Journal of Health Systems Research 16, no. 1 (March 30, 2022): 112–127. accessed November 17, 2025. https://he04.tci-thaijo.org/index.php/j_hsr/article/view/3484.