title: Is meta-analysis a valid approach to the evaluation of small effects in observational studies?
authors.affiliation: Slone Epidemiology Unit, Boston University School of Medicine, Brookline, Massachusetts 02146, USA.
authors.forename: S
authors.initials: S
authors.lastname: Shapiro
mesh_terms: D001943:Breast Neoplasms / Q000453:epidemiology; D016022:Case-Control Studies; D015984:Causality; D005260:Female; D006801:Humans; D010051:Ovarian Neoplasms / Q000453:epidemiology; D016032:Randomized Controlled Trials as Topic