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4. Center for System Science and Engineering at Johns Hopkins University. Covid-19 dashboard, 22 April 2020. https://coronavirus.jhu.edu/map.html
5. ToosiNLippmanDDiamondD. One week before inauguration, a warning: “The worst influenza pandemic since 1918.” Politico (Pavia)2020 Mar 16. https://www.politico.com/news/2020/03/16/trump-inauguration-warning-scenario-pandemic-132797.