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<p>Original location: <a href="http://d.p.h.free.fr/covid19/docs/2-File1-Document_9_Publication_of_Yang_Liu_et_al_in_VIRAL_IMMUNOLOGY_Volume_00_Number_00_07-04-2020.pdf">http://d.p.h.free.fr/covid19/docs/2-File1-Document_9_Publication_of_Yang_Liu_et_al_in_VIRAL_IMMUNOLOGY_Volume_00_Number_00_07-04-2020.pdf</a> </p>