We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleChanges in clinical trials methodology over time: a systematic review of six decades of research in psychopharmacology.AuthorsBrunoni AR; Tadini L; Fregni FPublicationPloS one, 2010, Vol 5, Issue 3, pe9479ISSN1932-6203Publication typearticleDOI10.1371/journal.pone.0009479