RT Journal Article SR Electronic T1 Dr. David Sackett, a giant among giants (1934–2015) JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 640 OP 641 DO 10.1503/cmaj.109-5072 VO 187 IS 9 A1 Roger Collier YR 2015 UL http://www.cmaj.ca/content/187/9/640.abstract AB