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Box-plot of trough metformin levels in 137 patients grouped in patients with eGFR <30 ml/min/1.73 m2 (n = 9), 30–60 ml/min/1.73 m2, and >60 ml/min/1.73 m2 (n = 107). The outliers marked in the group with eGFR >60 ml/min/1.73 m2 are most likely due to patients accidentally taking their medication before the blood test.
