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A 65-year-old patient with a past medical history of hypertension and type 1 diabetes mellitus presents to the ED with 4 days of weakness, nausea and vomiting. He takes ramipril, hydrochlorothiazide, Lantus and Humalog. Lab results show a potassium level of 6.3. Which of the following is the least likely to be underlying cause of hyperkalemia in this case?