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Shown are mean results of Epworth sleepiness scale (ESS) in original PD patients implanted a long-time ago (2006–2007) in both STN and PPTg. Histograms refer to before surgery (T0), then 3 (T1), and 12 months (T2) following surgery completion. A modest but significant amelioration of diurnal drowsiness is detected when PPTg-ON is introduced (for details, see Peppe et al., 2012).
