RT Journal Article SR Electronic T1 Evaluation of studies of causation (aetiology) JF Evidence Based Nursing JO Evid Based Nurs FD BMJ Publishing Group Ltd and RCN Publishing Company Ltd SP 36 OP 40 DO 10.1136/ebn.7.2.36 VO 7 IS 2 A1 Adamson, Joy YR 2004 UL http://ebn.bmj.com/content/7/2/36.abstract AB