Chaitanakul, C., and N. Komolsuradej. “Frequency and Associated Factors of Hypoglycemic Symptoms and Fear of Hypoglycemia in Elderly Patient with Type 2 Diabetes at Primary Care Unit of Songklanagarind Hospital”. Journal of Health Systems Research, vol. 13, no. 3, Sept. 2019, pp. 312-2, https://he04.tci-thaijo.org/index.php/j_hsr/article/view/3697.