TY - JOUR T1 - Purpose and Procedure JF - Evidence Based Medicine JO - Evid Based Med SP - 98 LP - 99 DO - 10.1136/ebm.1997.2.98 VL - 2 IS - 4 A2 - , Y1 - 1997/08/01 UR - http://ebm.bmj.com/content/2/4/98.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -