PT - JOURNAL ARTICLE ED - , TI - Purpose and procedure AID - 10.1136/ebn.2.2.34 DP - 1999 Apr 01 TA - Evidence Based Nursing PG - 34--35 VI - 2 IP - 2 4099 - http://ebn.bmj.com/content/2/2/34.short 4100 - http://ebn.bmj.com/content/2/2/34.full SO - Evid Based Nurs1999 Apr 01; 2