RT Journal Article SR Electronic T1 Review: anticonvulsants are better than placebo for reducing the frequency of migraine attacks JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 16 OP 16 DO 10.1136/ebm.10.1.16 VO 10 IS 1 YR 2005 UL http://ebm.bmj.com/content/10/1/16.abstract AB