Ruangritchankul, S., O. . Krairit, K. . Putthipokin, S. . . Chansirikarnjana, T. . Assavapokee, and S. . Sraium. “Polypharmacy Among Older Adults in Outpatient Clinic, Internal Medicine Department, Ramathibodi Hospital”. Thai Journal of Toxicology, vol. 33, no. 1, June 2018, pp. 35-50, https://li01.tci-thaijo.org/index.php/ThaiJToxicol/article/view/243627.