PT - JOURNAL ARTICLE ED - BMJ Publishing Group Ltd and RCN Publishing Company Ltd TI - Purpose and procedure AID - 10.1136/ebn.11.1.1 DP - 2008 Jan 01 TA - Evidence Based Nursing PG - 1--2 VI - 11 IP - 1 4099 - http://ebn.bmj.com/content/11/1/1.1.short 4100 - http://ebn.bmj.com/content/11/1/1.1.full SO - Evid Based Nurs2008 Jan 01; 11