1. Department of Physical Medicine and Rehabilitation, Liege University Hospital Center, Liege, Belgium
2. Department of Sport and Rehabilitation Sciences, University of Liege, Liege, Belgium
3. Coma science group, GIGA-Research, University and University hospital of Liege, Liege, Belgium
4. Department of Public Health, Epidemiology and Health Economics, University of Liege, Liege, Belgium
5. Department of Neurology, Liege University Hospital Center, Liege, Belgium