Kloyiam, S. (2022) “Why Insured Persons under Social Security Act Article 40 Missed Paying Contribution: A Qualitative Study”, Journal of Health Systems Research. Nonthaburi, Thailand, 16(3), pp. 390–406. available at: https://he04.tci-thaijo.org/index.php/j_hsr/article/view/3405 (accessed: 26 October 2025).