Marco Alessandrini1, Andrea Viziano1, Alessandro Micarelli2. 1. University of Rome Tor Vergata, Department of Clinical Sciences and Translational Medicine, Italy. 2. University of Rome Tor Vergata, Department of Clinical Sciences and Translational Medicine, Italy; ITER Center for Balance and Rehabilitation Research (ICBRR), Rome, Italy. Electronic address: alessandromicarelli@yahoo.it.