PT - JOURNAL ARTICLE ED - BMJ Publishing Group Ltd TI - Correction AID - 10.1136/ebmed1093 DP - 2012 Feb 01 TA - Evidence Based Medicine PG - 36--36 VI - 17 IP - 1 4099 - http://ebm.bmj.com/content/17/1/36.short 4100 - http://ebm.bmj.com/content/17/1/36.full SO - Evid Based Med2012 Feb 01; 17