Samniang, Nicharee. “Prevalence and associated factors of physical frailty in elderly patients at Geriatric Clinic, Nakornping Hospital”. Journal of Nakornping Hospital 15, no. 1 (March 20, 2024): 76–93. accessed April 13, 2025. https://he01.tci-thaijo.org/index.php/jnkp/article/view/267110.