RT Journal Article SR Electronic T1 A lifestyle intervention or metformin prevented or delayed the onset of metabolic syndrome in persons at risk JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 172 OP 172 DO 10.1136/ebm.10.6.172 VO 10 IS 6 YR 2005 UL http://ebm.bmj.com/content/10/6/172.abstract AB