Adaptive deep brain stimulation for Parkinson's disease demonstrates reduced speech side effects compared to conventional stimulation in the acute setting - Little, S; Tripoliti, E; Beudel, M; Pogosyan, A; Cagnan, H; Herz, D; Bestmann, S; Aziz, T; Cheeran, B; Zrinzo, L; Hariz, M; Hyam, J; et al. (BMJ Publishing Group, 2016)