1. Department of Public Health, Faculty of Medicine and Pharmacy, Vrije Universiteit Brussel, Brussels, Belgium;
2. Experimental and Applied Psychology, Faculty of Psychology and Educational Sciences, Vrije Universiteit Brussel, Brussels, Belgium;
3. University Hospital Pellenberg, Pellenberg, Belgium;
4. RehaClinic Zurzach, Bad Zurzach, Switzerland;
5. Department of Rehabilitation Sciences, Faculty of Physical Education and Physiotherapy, Brussels, Belgium;
6. Fachklinik Herzogenaurach, Herzogenaurach, Germany