Subthalamic Nucleus Stimulation in Parkinson's Disease: 5‐Year Extension Study of a Randomized Trial. - Bjerknes, Silje; Toft, Mathias; Brandt, Reidun; Rygvold, Trine Waage; Konglund, Ane; Dietrichs, Espen; Andersson, Stein; Skogseid, Inger Marie (Movement Disorders Clinical Practice, 2022)