title: Invited commentary: benefits of heterogeneity in meta-analysis of data from epidemiologic studies.
authors.affiliation: Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania School of Medicine, Philadelphia 19104-6021, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Berlin
mesh_terms: D002986:Clinical Trials as Topic; D004812:Epidemiologic Methods; D015201:Meta-Analysis as Topic