Risk factors for COVID-19 case fatality rate in people with type 1 and type 2 diabetes mellitus: A nationwide retrospective cohort study of 235,248 patients in the Russian Federation. - Shestakova MV; Vikulova OK; Elfimova AR; Deviatkin AA; Dedov II; Mokrysheva NG (Frontiers in endocrinology, 2022)