RT Journal Article SR Electronic T1 Review: brief primary care interventions are moderately effective for increasing physical activity JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 173 OP 173 DO 10.1136/ebm.5.6.173 VO 5 IS 6 YR 2000 UL http://ebm.bmj.com/content/5/6/173.abstract AB