BCI-Based Control for Ankle Exoskeleton T-FLEX: Comparison of Visual and Haptic Stimuli with Stroke Survivors. - Patricio Barria; Angie Pino; Nicolás Tovar; Daniel Gomez-Vargas; Karim Baleta; Camilo A. R. Díaz; Marcela C. Múnera; Carlos A. Cifuentes (Sensors, 2021)