RT Journal Article SR Electronic T1 Why Sackett‚s analysis of randomized controlled trials fails, but needn‚t JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 834 OP 835 VO 163 IS 7 A1 Stanley H. Shapiro A1 Kathleen Cranley Glass YR 2000 UL http://www.cmaj.ca/content/163/7/834.abstract