RT Journal Article SR Electronic T1 Questioning the evidence JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1304 OP 1305 DO 10.1503/cmaj.1060013 VO 174 IS 9 A1 Keren, Ron YR 2006 UL http://www.cmaj.ca/content/174/9/1304.2.abstract