1. Swiss Paraplegic Research, Health Services Research Group, Nottwil, Switzerland
2. Department of Health Sciences and Medicine, University of Lucerne, Lucerne, Switzerland
3. Swiss Paraplegic Research, Work and Integration Group, Nottwil, Switzerland
4. Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Science, Norwegian University of Sciences and Technology (NTNU), Trondheim, Norway
5. Department of Spinal Cord Injuries, Clinic of Physical Medicine and Rehabilitation, St Olav's University Hospital, Trondheim, Norway
6. Department of Rehabilitation Medicine, Wakayama Medical University, Wakayama, Japan
7. Department of Rehabilitation Medicine, Hannover Medical School, Hannover, Germany
8. Center for Rehabilitation in Global Health Systems, WHO Collaborating Center, Luzern, Switzerland