RT Journal Article SR Electronic T1 Using bar codes to create a robust national vaccine registry JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E344 OP E344 DO 10.1503/cmaj.76626 VO 193 IS 10 A1 Iris Gorfinkel YR 2021 UL http://www.cmaj.ca/content/193/10/E344.abstract