1. NeuroRehabLab, Madeira Interactive Techonologies Institute, Universidade da Madeira, Funchal, Portugal
2. Department of Computer Science and Engineering, Mississippi State University, Starkville, Missippi, USA
3. Institute for Systems and Robotics, Lisboa,Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
4. Faculdade de Ciências Exatas e da Engenharia, Universidade da Madeira, Funchal, Portugal