1. Neuromuscular Control Laboratory; Department of Biomechanical Engineering; Delft University of Technology; Delft The Netherlands
2. Department of Physical Therapy and Human Movement Sciences; Feinberg School of Medicine; Northwestern University; Chicago IL 60611 USA
3. Department of Biomedical Engineering; McCormick school of Engineering; Northwestern University; Evanston IL USA
4. MIRA Institute for Biomedical Technology and Technical Medicine; University of Twente; Enschede The Netherlands