Targeting the Thalamic Ventrointermediate Nucleus for Neurosurgical Treatment of Tremor Using Q-Ball Calculation - Oertel, M. F.; Lönnfors-Weitzel, T.; Stieglitz, L. H.; Kiefer, C.; Pica, A.; Schüpbach, M.; Kaelin, A.; Meier, N.; Pollo, C. (Journal of Neurological Surgery Part A: Central European Neurosurgery, 2012)