Witthayapipopsakul, W., Y. Wanwong, A. Islam Marshall, S. Chotchoungchatchai, W. Patcharanarumol, and V. Tangcharoensathien. “Effective Coverage and Its Application in the Thai Context”. Journal of Health Systems Research, vol. 16, no. 1, Mar. 2022, pp. 112-27, https://he04.tci-thaijo.org/index.php/j_hsr/article/view/3484.