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Stephan, Marianne; Meier, Beat; Weber Zaugg, Sabine; Kaelin-Lang, Alain (2011). Motor sequence learning performance in Parkinson's disease patients depends on the stage of disease. Brain and cognition, 75(2), pp. 135-140. San Diego, Calif.: Elsevier Science 10.1016/j.bandc.2010.10.015
