RT Journal Article SR Electronic T1 Adverse events: past and future JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 549 OP 550 DO 10.1503/cmaj.1040721 VO 171 IS 6 A1 Johnson, Neil A1 Roy, Myrella T. YR 2004 UL http://www.cmaj.ca/content/171/6/549.3.abstract