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Time to first event for myocardial infarction or stroke by treatment allocation in meta-analyses of five trials of calcium monotherapy (top panels) and in participants in the Women’s Health Initiative (WHI) calcium and vitamin D trial not using personal calcium supplements at randomization (bottom panels) [Bolland et al. 2010a, 2011b]. Note the different scales on the y and x axes. HR, hazard ratio; CI, confidence interval.
