We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleIdentification of additional trials in prospective trial registers for Cochrane systematic reviews.Authorsvan Enst WA; Scholten RJ; Hooft LPublicationPloS one, 2012, Vol 7, Issue 8, pe42812ISSN1932-6203Publication typearticleDOI10.1371/journal.pone.0042812