RT Journal Article SR Electronic T1 Rapid antigen tests for SARS-CoV-2 JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E447 OP E447 DO 10.1503/cmaj.202827 VO 193 IS 13 A1 Michael Liu A1 Rahul K. Arora A1 Mel Krajden YR 2021 UL http://www.cmaj.ca/content/193/13/E447.abstract