We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleEvidence for risk of bias in cluster randomised trials: review of recent trials published in three general medical journalsAuthorsPuffer, S.PublicationBMJ, 2003, Vol 327, Issue 7418, p785ISSN0959-8138Publication typearticleDOI10.1136/bmj.327.7418.785