TY - JOUR T1 - Grading evidence JF - Canadian Medical Association Journal JO - CMAJ SP - 928 LP - 929 DO - 10.1503/cmaj.1031694 VL - 170 IS - 6 AU - Gerald J.M. Tevaarwerk Y1 - 2004/03/16 UR - http://www.cmaj.ca/content/170/6/928.abstract ER -