Liang, Guolong, Suwanna Arunpongpaisal, Pattapong Kessomboon, Somdej Pinitsoontorn, and Piyathida Kuhirunyaratn. 2013. “Depression and Cognitive Impairment Among the Community Dwelling Elderly in a Community of Khon Kaen : A Primary Care Setting Descriptive Study”. Journal of the Psychiatric Association of Thailand 54 (4):357-66. https://he01.tci-thaijo.org/index.php/JPAT/article/view/7685.