We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitlePower and sample size calculations for case-control studies of gene-environment interactions with a polytomous exposure variable.AuthorsFoppa I; Spiegelman DPublicationAmerican journal of epidemiology, 1997, Vol 146, Issue 7, p596ISSN0002-9262Publication typearticleDOI10.1093/oxfordjournals.aje.a009320