We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleApplication of the case-crossover design to reduce unmeasured confounding in studies of condom effectiveness.AuthorsWarner L; Macaluso M; Austin HD; Kleinbaum DK; Artz L; Fleenor ME; Brill I; Newman DR; Hook EW 3rdPublicationAmerican journal of epidemiology, 2005, Vol 161, Issue 8, p765ISSN0002-9262Publication typearticleDOI10.1093/aje/kwi094