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Forest plot: WMD in UPDRS III scores from baseline to 2 years and 3 years post-DBS; off-medication change and 95% CI. Two years post-DBS. CI = confidence interval, DBS = deep brain stimulation, GPi = globus pallidus pars interna, STN = subthalamic nucleus, UPDRS = Unified Parkinson's Disease Rating Scale, WMD = weighted mean difference.
