RT Journal Article SR Electronic T1 Review: metformin does not increase risk of lactic acidosis or increase lactate levels in type 2 diabetes JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 111 OP 111 DO 10.1136/ebm.9.4.111 VO 9 IS 4 YR 2004 UL http://ebm.bmj.com/content/9/4/111.abstract AB