1. Faculty of Health Sciences and Medicine, University of Lucerne, Lucerne, Switzerland
2. Swiss Paraplegic Research, Nottwil, Switzerland
3. Center for Rehabilitation in Global Health Systems, WHO Collaborating Center, University of Lucerne, Lucerne, Switzerland
4. Sensory Functions, Disability and Rehabilitation Unit, Department for Noncommunicable Diseases, World Health Organization, Geneva, Switzerland