RT Journal Article SR Electronic T1 Medical error affects nearly 25% of Canadians JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 123 OP 123-a DO 10.1503/cmaj.1041037 VO 171 IS 2 A1 Louise Gagnon YR 2004 UL http://www.cmaj.ca/content/171/2/123.2.abstract