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The aim of this study was to establish a new stepwise type of acute challenge test with incremental doses of levodopa/benserazide, and verify its predictive value in follow-up diagnoses and outcomes of deep-brain stimulation (DBS) in treated patients with parkinsonism.Prospective cohort study.The optimal cutoff points for UPDRS-III improvement in these stepwise levodopa tests. In this study, we established...
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