PT - JOURNAL ARTICLE ED - BMJ Publishing Group Ltd TI - Correction AID - 10.1136/qshc.2008.028068corr1 DP - 2011 May 01 TA - BMJ Quality & Safety PG - 396--396 VI - 20 IP - 5 4099 - http://qualitysafety.bmj.com/content/20/5/396.2.short 4100 - http://qualitysafety.bmj.com/content/20/5/396.2.full SO - BMJ Qual Saf2011 May 01; 20