RT Journal Article SR Electronic T1 Measures of association as used to address therapy, harm, and aetiology questions JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 102 OP 103 DO 10.1136/ebm.10.4.102 VO 10 IS 4 A1 Stuart Carney A1 Helen Doll YR 2005 UL http://ebm.bmj.com/content/10/4/102.abstract AB