Sumretphol, Supitcha, and Prathurng Hongsranagon. 2017. “Knowledge and Attitude Toward the Selection of Health Insurance Type After Retirement in Ratchaburi Province, Thailand”. Journal of Health Research 30 (Suppl. 2):S99-S105. https://he01.tci-thaijo.org/index.php/jhealthres/article/view/80728.