RT Journal Article SR Electronic T1 Sixty-nine years after surviving the polio epidemic JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E1915 OP E1917 DO 10.1503/cmaj.210985 VO 193 IS 50 A1 Barry J. McMahon A1 Sue Dojeiji A1 Rene A. Leiva A1 Joan M. Fisher YR 2021 UL http://www.cmaj.ca/content/193/50/E1915.abstract