We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleHeterogeneity of the baseline risk within patient populations of clinical trials: a proposed evaluation algorithm.AuthorsIoannidis JP; Lau JPublicationAmerican journal of epidemiology, 1998, Vol 148, Issue 11, p1117ISSN0002-9262Publication typearticleDOI10.1093/oxfordjournals.aje.a009590