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Deuschl, Günther; Schüpbach, Michael; Knudsen, Karina; Pinsker, Marcus O.; Cornu, Philippe; Rau, Jörn; Agid, Yves; Schade-Brittinger, Carmen (2013). Stimulation of the subthalamic nucleus at an earlier disease stage of Parkinson's disease: Concept and standards of the EARLYSTIM-study. Parkinsonism & related disorders, 19(1), pp. 56-61. Oxford: Elsevier 10.1016/j.parkreldis.2012.07.004