Sukchan, P., W. Chemoh, and K. Payanglee. “Morbidity and Multi-Morbidity Among the Elderly Population in Southernmost Thailand: Cox Proportional Hazards Regression Model of Survival Approach”. Princess of Naradhiwas University Journal, vol. 12, no. 1, Nov. 2019, pp. 89-105, https://li01.tci-thaijo.org/index.php/pnujr/article/view/213939.