RT Journal Article SR Electronic T1 No evidence for switching antidepressants in treatment-resistant depressed patients JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 120 OP 121 DO 10.1136/ebm1083 VO 15 IS 4 A1 Michael E Thase YR 2010 UL http://ebm.bmj.com/content/15/4/120.abstract AB