Bone corticalis microarchitecture (µCT) of iliac crest samples from patients taking potassium citrate or potassium chloride at baseline and after 12 months of treatment, as well as of living organ donors (reference value). Ref., reference; K-Cit, potassium citrate; K-Cl, potassium chloride; Ct.Th, cortical thickness; BV, bone volume; TV, total volume; CT.Po, cortical porosity.