1. Department Physical Therapy, Rehabilitation Research, Vrije Universiteit Brussel, Laarbeeklaan 103, B-1090 Brussels, Belgium, Occupational Therapy Service, National MS Centre, Vanheylenstraat 16, B-1820 Melsbroek, Belgium,
2. Department Physical Therapy, Rehabilitation Research, Vrije Universiteit Brussel, Laarbeeklaan 103, B-1090 Brussels, Belgium
3. AISM - Rehabilitation Centre, Via Alizeri 3A, 16126 Genova, Italy
4. AISM - Rehabilitation Centre, Vicolo Cavour 14, 35030 Villaguattera di Rubano, Padova, Italy
5. Hospital de Dia de Esclerosi Multiple, C/Teodora Lamadrid 21=23, 08022 Barcelona, Spain
6. Department of Neurology, University Medical Centre Ljubljana, Zaloska 2, 1000 Ljubljana, Slovenia