1. Department of Life, Health and Environmental Sciences, University of L’Aquila, L’Aquila, Italy
2. San Raffaele Institute of Sulmona, Sulmona, Italy
3. Department of Health Sciences and Technology, Sensory-Motor Systems Lab, Institute of Robotics and Intelligent Systems, ETH Zurich, Zurich, Switzerland
4. Spinal Cord Injury Center, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
5. Department of Electrical and Information Engineering, Politecnico di Bari, Bari, Italy
6. The BioRobotics Institute, Scuola Superiore Sant’Anna, Pisa, Italy