TRENDS OF COVID-19 IN THE CENTRAL AFRICA SUB-REGION: EFFECTIVE HEALTH CARE, EFFECT OF ENDOGENOUS PARAMETERS OR A MATTER OF TIME? Article Arsene M.MJ., Mouafo H.T., Podoprigora I.V., Smolyakova L.A., Yashina N.V., Ermolaev A.V., Mefyod K.M., Zhygunova A.V. JOURNAL OF PHARMACEUTICAL RESEARCH INTERNATIONAL. SCIENCEDOMAIN INT. Vol. 33. 2021. P. 170-186