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URL: http://scholar.google.com/scholar_lookup?title=Effectiveness+of+convalescent+plasma+therapy+in+severe+COVID-19+patients&year=2020&author=Duan&journal=Proc+Natl+Acad+Sci+USA&volume=117&issue=17&pages=9490-9496&doi=10.1073%2Fpnas.2004168117&pmid=32253318