RT Journal Article SR Electronic T1 Drawing policy conclusions from uncontrolled studies JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 317 OP 318 VO 170 IS 3 A1 Boris Sobolev A1 Mark FitzGerald A1 Dale Mercer YR 2004 UL http://www.cmaj.ca/content/170/3/317.2.abstract