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Perceived susceptibility, severity, and reinfection of COVI..:

Giao Huynh ; Thien Thuan Tran ; Han Thi Ngoc Nguyen.
http://www.apjtm.org/article.asp?issn=1995-7645;year=2021;volume=14;issue=5;spage=239;epage=240;aulast=Huynh.  , 2021