RT Journal Article SR Electronic T1 What is a systematic review? JF Evidence Based Nursing JO Evid Based Nurs FD BMJ Publishing Group Ltd and RCN Publishing Company Ltd SP 64 OP 64 DO 10.1136/ebn.2011.0049 VO 14 IS 3 A1 Clarke, Jane YR 2011 UL http://ebn.bmj.com/content/14/3/64.abstract AB