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Flow chart of the study design showing how patients with renal underexcretion–type gout were organized into the benzbromarone and febuxostat treatment groups. FEUA = fractional excretion of urate; UUE = uric acid excretion; eGFR = estimated glomerular filtration rate; SU = serum urate; ALT = alanine aminotransferase; AST = aspartate aminotransferase.
