1 Board of Physical Medicine and Rehabilitation, Department of Orthopaedic Science, "Sapienza" University, Rome, Italy; Don Carlo Gnocchi ONLUS Foundation, Milan, Italy. Electronic address: danielecoraci@aol.com.
3 Don Carlo Gnocchi ONLUS Foundation, Milan, Italy.
4 Board of Physical Medicine and Rehabilitation, Department of Orthopaedic Science, "Sapienza" University, Rome, Italy; Physical Medicine and Rehabilitation Unit, Azienda Policlinico Umberto I, Rome, Italy.
5 Don Carlo Gnocchi ONLUS Foundation, Milan, Italy; Department of Geriatrics, Neurosciences and Orthopaedics, Università Cattolica del Sacro Cuore, Rome, Italy.