Fig. 3
As of May 18, 2020, the confirmed cases of COVID-19 in several countries. Data collected from WHO Coronavirus disease 2019 (COVID-19) situation reports [11]
Fig. 3 | BMC Materials
As of May 18, 2020, the confirmed cases of COVID-19 in several countries. Data collected from WHO Coronavirus disease 2019 (COVID-19) situation reports [11]