1Department of Neurology, School of Medicine, Oregon HealthScience University, 505 NW 185th Avenue, Beaverton, OR, 97006, USA
2Functional and Applied Biomechanics Laboratory, Rehabilitation Medicine DepartmentNational Institutes of Health, Clinical Center, Building 10MSC 1604, Bethesda, MD, 20892, USA
3Biomedical Engineering UnitDepartment of ElectronicsComputer ScienceSystems, Alma Mater Studiorum-Universita’ di Bologna, Viale Risorgimento 2, Bologna, 40136, Italy