RT Journal Article SR Electronic T1 What’s important to know about the new COVID-19 variants? JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E141 OP E142 DO 10.1503/cmaj.1095915 VO 193 IS 4 A1 Diana Duong YR 2021 UL http://www.cmaj.ca/content/193/4/E141.abstract