We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleDesign and analysis of controlled trials in naturally clustered environments: implications for medical informatics.AuthorsChuang JH; Hripcsak G; Heitjan DFPublicationJournal of the American Medical Informatics Association : JAMIA, 2002, Vol 9, Issue 3, p230ISSN1067-5027Publication typearticleDOI10.1197/jamia.m0997