RT Journal Article SR Electronic T1 COVID-19 and changes to postgraduate medical education in Canada JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E1018 OP E1020 DO 10.1503/cmaj.200882 VO 192 IS 35 A1 McCarthy, Colm A1 Carayannopoulos, Kallirroi A1 Walton, J. Mark YR 2020 UL http://www.cmaj.ca/content/192/35/E1018.abstract