1 Board of Physical Medicine and Rehabilitation, Department of Orthopaedic Science, "Sapienza" University, Rome, Italy.
2 Board of Physical Medicine and Rehabilitation, Department of Orthopaedic Science, "Sapienza" University, Rome, Italy ; Physical Medicine and Rehabilitation Unit, "Umberto I" polyclinic, Rome, Italy.
3 Don Gnocchi Foundation, Piazzale Morandi 6, 20100 Milan, Italy.
4 Don Gnocchi Foundation, Piazzale Morandi 6, 20100 Milan, Italy ; Institute of Neurology, Catholic University, 20121 Rome, Italy.