Bang E, Lee B, Park J, Jang Y, Kim A, Kim S, Shin H.  The Improving Effect of HL271, a Chemical Derivative of Metformin, a Popular Drug for Type II Diabetes Mellitus, on Aging-induced Cognitive Decline.  Exp Neurobiol 2018;27:45-56.  https://doi.org/10.5607/en.2018.27.1.45