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[2] https://www.timesofisrael.com/mass-testing-empty-icus-germany-scores-early-against-virus/
[5] www.reuters.com/artcle/us-health-coronavirus-netherlands-study/dutch-study-suggests-3-of-population-may-have-coronavirus-antibodies-idUSKCN21Y102
[6] https://www.vox.com/2020/4/24/21229415/coronavirus-antibody-testing-covid-19-california-survey
[7] https://www.nytimes.com/2020/04/17/us/coronavirus-death-rate.html
[8] https://futurism.com/neoscope/half-coronavirus-carriers-no-symptoms