title: Commentary: On Effect Measures, Heterogeneity, and the Laws of Nature.
authors.affiliation: From the aDivision of Cancer Epidemiology & Genetics, National Cancer Institute, National Institutes of Health, Bethesda, MD; and bCenter for Evidence-based Medicine, and Department of Health Services, Policy & Practice, School of Public Health, Brown University, Providence, RI.
authors.forename: Orestis A
authors.initials: OA
authors.lastname: Panagiotou
authors.forename: Thomas A
authors.initials: TA
authors.lastname: Trikalinos
mesh_terms: D015984:Causality; D006801:Humans; D015201:Meta-Analysis as Topic; D015233:Models, Statistical