1 Don Carlo Gnocchi Onlus Foundation, Milan, Italy. Electronic address: danielecoraci@aol.com.
2 Don Carlo Gnocchi Onlus Foundation, Milan, Italy.
3 Don Carlo Gnocchi Onlus Foundation, Milan, Italy; Department of Geriatrics, Neurosciences and Orthopaedics, Catholic University of the Sacred Heart, Rome, Italy.