RT Journal Article SR Electronic T1 Rapid antigen screening of asymptomatic people as a public health tool to combat COVID-19 JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E449 OP E452 DO 10.1503/cmaj.210100 VO 193 IS 13 A1 Kevin L. Schwartz A1 Allison J. McGeer A1 Isaac I. Bogoch YR 2021 UL http://www.cmaj.ca/content/193/13/E449.abstract