Is improvement in the quality of life after subthalamic nucleus stimulation in Parkinson's disease predictable?

Christine Daniels, Paul Krack, Jens Volkmann, Jan Raethjen, Markus O. Pinsker, Manja Kloss, Volker Tronnier, Alfons Schnitzler, Lars Wojtecki, Kai Bötzel, Adrian Danek, Rüdiger Hilker, Volker Sturm, Andreas Kupsch, Elfriede Karner, Günther Deuschl, Karsten Witt^*