RT Journal Article SR Electronic T1 Google proposes evidence-based search rankings JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 483 OP 483 DO 10.1503/cmaj.109-5017 VO 187 IS 7 A1 Roger Collier YR 2015 UL http://www.cmaj.ca/content/187/7/483.abstract AB