1 Institute of Neurology, Università Cattolica del Sacro Cuore, Rome, Italy.
2 Institute of Neurology, Campus Bio-Medico University, Rome, Italy.
3 Institute of Neurology, Università Cattolica del Sacro Cuore, Rome, Italy; Don Gnocchi Foundation, Rome, Italy.
4 Don Gnocchi Foundation, Rome, Italy; Board of Physical Medicine and Rehabilitation, Department of Orthopaedic Science, "Sapienza" University, Rome, Italy. Electronic address: danielecoraci@aol.com.
5 Laboratory of Biomedical Robotics and Biomicrosystems, Campus Bio-Medico University, Rome, Italy.