PT - JOURNAL ARTICLE ED - , TI - Purpose and procedure AID - 10.1136/ebn.1.4.98 DP - 1998 Oct 01 TA - Evidence Based Nursing PG - 98--99 VI - 1 IP - 4 4099 - http://ebn.bmj.com/content/1/4/98.short 4100 - http://ebn.bmj.com/content/1/4/98.full SO - Evid Based Nurs1998 Oct 01; 1