https://api.elsevier.com/content/article/pii/S2405844021006642doi:10.1016/j.heliyon.2021.e065611-s2.0-S240584402100664210.1016/j.heliyon.2021.e06561S2405-8440(21)00664-2Clinical characteristics and risk factors for disease severity and mortality of COVID-19 patients with diabetes mellitus in Kazakhstan: A nationwide study HeliyonJournal240584402021-03-31March 20211trueFullfalseAuthorhttp://creativecommons.org/licenses/by-nc-nd/4.0/