PT - JOURNAL ARTICLE ED - , AID - 10.1136/ebm.12.6.166-a DP - 2007 Dec 01 TA - Evidence Based Medicine PG - 166--166 VI - 12 IP - 6 4099 - http://ebm.bmj.com/content/12/6/166.2.short 4100 - http://ebm.bmj.com/content/12/6/166.2.full SO - Evid Based Med2007 Dec 01; 12