RT Journal Article SR Electronic T1 US adopts bar codes for drug products JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1657 OP 1657 DO 10.1503/cmaj.1040617 VO 170 IS 11 A1 Milan Korcok YR 2004 UL http://www.cmaj.ca/content/170/11/1657.abstract