PT - JOURNAL ARTICLE ED - , TI - Purpose and procedure AID - 10.1136/ebn.1.1.2 DP - 1998 Jan 01 TA - Evidence Based Nursing PG - 2--3 VI - 1 IP - 1 4099 - http://ebn.bmj.com/content/1/1/2.short 4100 - http://ebn.bmj.com/content/1/1/2.full SO - Evid Based Nurs1998 Jan 01; 1