PT - JOURNAL ARTICLE ED - , TI - PURPOSE AND PROCEDURE (ABBREVIATED) AID - 10.1136/ebm.5.2.34 DP - 2000 Mar 01 TA - Evidence Based Medicine PG - 34--34 VI - 5 IP - 2 4099 - http://ebm.bmj.com/content/5/2/34.short 4100 - http://ebm.bmj.com/content/5/2/34.full SO - Evid Based Med2000 Mar 01; 5