1. Rehabilitation Research Department, Vrije Universiteit Brussel, Brussels, Belgium
2. Department of Physical Therapy and Rehabilitation, Universiteit Gent, Gent, Belgium
3. Department of Rehabilitation Sciences and Physical Therapy, Universiteit Antwerpen, Wilrijk, Belgium
4. Department of Biostatistics and Informatics, Vrije Universiteit Brussel, Brussels, Belgium
5. Department of Public Health (GEWE), Vrije Universiteit Brussel, Brussels, Belgium