Riabokon, O. V., V. V. Cherkaskyi, Onishchenkо T. Ye., and Yu. Yu. Riabokon. 2021. “Features of Comorbid Pathology Spectrum and Age Structure of Oxygen-Dependent Patients With Severe Coronavirus Disease 2019 (COVID-19) Depending on Outcomes of the Disease”. Zaporozhye мedical Journal 23 (2):214-19. https://doi.org/10.14739/2310-1210.2021.2.228712.