PT - JOURNAL ARTICLE AU - Richard Lehman AID - 10.1136/ebm.12.6.167 DP - 2007 Dec 01 TA - Evidence Based Medicine PG - 167--167 VI - 12 IP - 6 4099 - http://ebm.bmj.com/content/12/6/167.short 4100 - http://ebm.bmj.com/content/12/6/167.full SO - Evid Based Med2007 Dec 01; 12