Before revision:  Results: The correlation between case-fatality ratios and rates of mortality for COVID-19  in different regions of the Russian Federation on Sep 6 , 2020 is 0.69 (0.56,0.79).
After revision:  Results: The correlation between case-fatality ratios and rates of mortality for COVID-19 in different regions of the Russian Federation on Sep 6 , 000 and the highest CFR (lowest detectability of SARS-CoV-2 infection) is the city of St. Petersburg.