 1 month after implantation treatment will be started. Patients will be randomized to one of the following 3 treatment groups: Subthalamic nucleus STN or Ventral intermediate nucleus VimDRT or combined stimulation VimDRTSTN. Patients will undergo all three treatment groups each lasting 3 months. The patient is blinded meaning that study patients will not know what kind of treatment e.g. moderegion of stimulation they receive. 