RT Journal Article SR Electronic T1 Adverse events: past and future JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 550 OP 550 DO 10.1503/cmaj.1041021 VO 171 IS 6 A1 Alan J. Forster A1 Carl van Walraven YR 2004 UL http://www.cmaj.ca/content/171/6/550.abstract