RT Journal Article SR Electronic T1 Most add-on therapies to metformin have similar effects on HbA1c JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 223 OP 223 DO 10.1136/ebmed-2016-110515 VO 21 IS 6 A1 Thomas Karagiannis A1 Eleni Bekiari YR 2016 UL http://ebm.bmj.com/content/21/6/223.abstract AB