Back to matchesWe found a matchYour institution may have rights to this item. Sign in to continue.TitleProceedings of the Society for Epidemiologic Research1.PublicationAmerican Journal of Epidemiology, 1986, Vol 124, Issue 3, p497ISSN0002-9262Publication typeArticleDOI10.1093/oxfordjournals.aje.a114426