1. Neural and Cognitive Engineering Group; Centre for Automation and Robotics CSIC-UPM; Madrid Spain
2. Department of Physiology; Feinberg School of Medicine; Northwestern University; Chicago IL USA
3. Department of Neurology; Johns Hopkins University; Baltimore MD USA
4. Movement Control and Neuroplasticity Research Group; KU Leuven; Leuven Belgium
5. Center for the Neural Basis of Cognition; University of Pittsburgh; Pittsburgh PA 15213 USA