1. Neural Rehabilitation Group, Cajal Institute, Spanish National Research Council (CSIC), Madrid, Spain
2. E.T.S. Ingenieros de Telecomunicación, Universidad Politécnica de Madrid, Madrid, Spain
3. Movement Disorders Unit, Department of Neurology, Hospital General Universitario Gregorio Marañón, Madrid, Spain
4. Legs & Walking AbilityLab, Shirley Ryan AbilityLab, Chicago, IL, USA