RT Journal Article SR Electronic T1 CMA urges national action to curb third wave of COVID-19 JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E653 OP E654 DO 10.1503/cmaj.1095938 VO 193 IS 18 A1 Lauren Vogel YR 2021 UL http://www.cmaj.ca/content/193/18/E653.abstract