1. Coronavirus Disease 2019 (COVID-19)https://www.mayoclinic.org/diseases-conditions/coronavirus/symptoms-causes/syc-20479963
2. Coronavirus Disease 2019 (COVID-19) Situation Report—51https://www.who.int/docs/default-source/coronaviruse/situation-reports/20200311-sitrep-51-covid-19.pdf?sfvrsn=1ba62e57_10
3. COVID-19 Dashboardhttps://coronavirus.jhu.edu/map.html
4. ISS per COVID-19https://www.iss.it/en/coronavirus