1. Center for Neurology and Hertie Institute for Clinical Brain Research; Department of Neurodegenerative Diseases; University of Tübingen; Tübingen Germany
2. DZNE; German Center for Neurodegenerative Diseases; Tübingen Germany
3. Ecole Polytechnique Fédérale de Lausanne; Laboratory of Movement Analysis and Measurement; Lausanne Switzerland
4. Department of Electrical, Electronic, and Information Engineering “Guglielmo Marconi”; University of Bologna; Bologna Italy