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(colour online) The non-linear association meta-analysis between adjusted hazard ratios of all-cause mortality and sodium intake among studies using (a) dietary intake assessment and (b) urinary sodium excretion. Sodium intake was modelled with restricted cubic splines in a multivariate random-effects dose–response model (
, linear model; 
, spline model; 
, 95% CI); the vertical axis is on a log scale
