RT Journal Article SR Electronic T1 Shedding light on retractions JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E385 OP E386 DO 10.1503/cmaj.109-3827 VO 183 IS 7 A1 Roger Collier YR 2011 UL http://www.cmaj.ca/content/183/7/E385.abstract