TY - JOUR T1 - Reference-based refinements JF - Canadian Medical Association Journal JO - CMAJ SP - 1115 LP - 1115 VL - 168 IS - 9 AU - Sebastian Schneeweiss AU - Colin Dormuth Y1 - 2003/04/29 UR - http://www.cmaj.ca/content/168/9/1115.1.abstract ER -