We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleContamination in trials: is cluster randomisation the answer?AuthorsTorgerson, D JPublicationBMJ (Clinical research ed.), 2001, Vol 322, Issue 7282, p355ISSN0959-8138Publication typeJournal ArticleDOI10.1136/bmj.322.7282.355