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Some studies have suggested that deep brain stimulation (DBS) of the subthalamic nucleus (STN) for Parkinson disease (PD) has more durable benefits on motor function than DBS of the globus pallidus interna (GPi). However, long-term outcomes from randomized trials have been lacking. Now, researchers have published the long-awaited 3-year findings of the randomized, partially manufacturer-funded Veterans Affairs–National Institute of Neurological Disorders and Stroke trial comparing STN DBS with GPi DBS. Of 198 patients randomized, 159 had 36-month follow-up (89 with GPi DBS and 70 with STN DBS). The primary outcome was motor function while patients were on stimulation and off medication, measured with the Unified Parkinson's Disease Rating S…