Gerold Stucki1,2,3, Jerome Bickenbach4,5,6. 1. Swiss Paraplegic Research, Nottwil, Switzerland. Gerold.Stucki@paraplegie.ch. 2. Department of Health Sciences and Medicine, University of Lucerne, Lucerne, Switzerland. Gerold.Stucki@paraplegie.ch. 3. Center for Rehabilitation in Global Health Systems, WHO Collaborating Center, University of Lucerne, Lucerne, Switzerland. Gerold.Stucki@paraplegie.ch. 4. Swiss Paraplegic Research, Nottwil, Switzerland. 5. Department of Health Sciences and Medicine, University of Lucerne, Lucerne, Switzerland. 6. Center for Rehabilitation in Global Health Systems, WHO Collaborating Center, University of Lucerne, Lucerne, Switzerland.