RT Journal Article SR Electronic T1 Evidence-based practice: a primer for health care professionals JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 104 OP 104 DO 10.1136/ebm.6.4.104 VO 6 IS 4 A1 John Sellors YR 2001 UL http://ebm.bmj.com/content/6/4/104.abstract AB