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Forest plot for the pooled relative risk (RR) from prospective studies of linoleic acid and breast cancer risk. The study-specific RR and 95 % CI are represented by the black dot and horizontal line, respectively; the area of the grey square is proportional to the specific-study weight to the overall meta-analysis. The centre of the open diamond presents the pooled RR and its width represents the pooled 95 % CI. D+L denotes the random-effect model; I–V denotes the fixed-effect model
