Ovod , A. I., Oleynikova , T. A., Urusova , T. I., Reztsova , T. V., Ulyanov , V. O. and Menshikova , O. V. (2021) “Variations in indicators of the health sector and the pharmaceutical market in Russia during 2020”, Journal of the University of Zulia , 12(33), pp. 349-363. doi: 10.46925//rdluz.33.25.