1. Department of Behavioral Sciences Methods, University of Barcelona, Barcelona, Spain;
2. Institute for Brain, Cognition and Behavior (IR3C), University of Barcelona, Barcelona, Spain;
3. ICF Research Branch, a cooperation partner within the WHO Collaborating Centre for the Family of International Classifications in Germany (at DIMDI), Nottwil, Switzerland;
4. Swiss Paraplegic Research, Nottwil, Switzerland