RT Journal Article SR Electronic T1 Google proposes evidence-based search rankings JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP cmaj.109-5017 DO 10.1503/cmaj.109-5017 A1 Roger Collier YR 2015 UL http://www.cmaj.ca/content/early/2015/03/16/cmaj.109-5017.abstract AB