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Serum levels of campesterol and risk of cardiovascular disease (A: absolute concentrations, B: ratios to total cholesterol). D + L: DerSimonian & Laird random effects estimate; I-V: inverse variance fixed effects estimate; diamonds: point estimate and 95% confidence interval; boxes: size proportional to study weight for random effects approach; black line: reference line indicating the absence of effect; blue line: point estimate of random effects approach.
