RT Journal Article SR Electronic T1 Users' guides to the nursing literature: an introduction JF Evidence Based Nursing JO Evid Based Nurs FD BMJ Publishing Group Ltd and RCN Publishing Company Ltd SP 71 OP 72 DO 10.1136/ebn.3.3.71 VO 3 IS 3 A1 Nicky Cullum YR 2000 UL http://ebn.bmj.com/content/3/3/71.abstract AB