Comment on Samara et al. Metformin Use Is Associated With Slowed Cognitive Decline and Reduced Incident Dementia in Older Adults With Type 2 Diabetes: The Sydney Memory and Ageing Study. - Violante Cumpa, Jorge Rafael; Pérez Arredondo, Luis Alberto; González González, José Gerardo; Mancillas Adame, Leonardo Guadalupe (American Diabetes Association, 2021)