Figure 1
From: Hypercalcemia in patients with bipolar disorder treated with lithium: a cross-sectional study
![Figure 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F2194-7511-1-18/MediaObjects/40345_2013_Article_14_Fig1_HTML.jpg)
Distribution curves of serum calcium levels in lithium users ( n = 314) and non-lithium users ( n = 15). The red line illustrates the upper limit of the serum calcium level of 2.60 (mmol/L). The two dotted lines are placed upon the mean serum calcium levels of both groups; the left dotted line corresponds with the non-lithium users, the right dotted line with the lithium users.