1. Neurocybernetics and Rehabilitation, Clinic for Neurology and Stereotactic Neurosurgery, Otto-von-Guericke University, Leipziger Straße 44, 39120 Magdeburg, Germany
2. Biomedical Engineering Section, School of Biological Sciences, University of Reading, Reading, RG6 6AY, UK
3. Bioengineering and Biomechanics Laboratory, Federal University of Goiás, Goiânia, Brazil
4. Faculty of Electrical Engineering, Centre for Innovation and Technology Assessment in Health, Postgraduate Program in Electrical and Biomedical Engineering, Federal University of Uberlândia, Uberlândia, Brazil