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Correlations between salivary and serum lithium levels, unadjusted (A), and adjusted for relevant covariables, (B). Unadjusted correlation was determined by Spearman correlation analysis (r = 0.74; p < 0.0001). Adjusted correlation (Spearman rho = 0.77, p < 0.0001) was determined by multivariate linear regression analysis including adjustment for daily lithium dose, type 2 diabetes, and smoking
