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. 2021 May 1;21:837. doi: 10.1186/s12889-021-10899-2

Fig. 1.

Fig. 1

Timeline of the COVID-19 outbreak and assessment period. Shows the number of newly reported infections in blue and the number of newly reported deaths in red; the recruitment period is shaded in blue; data by the European Centre for Disease Prevention and Control [27]; * negative values are not shown but can occur when a country sends a correction to the ECDC, because it had previously overestimated the number of cases/deaths