1 Laboratory for Engineering of the Neuromuscular System (LISiN), Department of Electronic Engineering and Telecommunications, Politecnico di Torino, Turin, Italy.
2 LAM - Motion Analysis Laboratory, Correggio, Neuromotor and Rehabilitation Department, Azienda Unita' Sanitaria Locale, Istituto di Ricerca e Cura a Carattere Scientifico di Reggio Emilia, Reggio Emilia, Italy.
3 Shirley Ryan Ability Lab, Single Motor Unit Laboratory, Chicago, IL, United States.
4 Department of Rehabilitation and Prevention Engineering, Institute of Applied Medical Engineering, Rheinisch-Westfälische Technische Hochschule Aachen University, Aachen, Germany.