1. Department of Movement and Rehabilitation Science, University of Applied Sciences Osnabrück, Wupppertal, Germany
2. Department of Physiotherapy, Klinik Für Manuelle Therapie, Hamm, Germany
3. Faculty of Medicine, University of Duisburg-Essen, Essen, Germany
4. Department of Neurology, Agaplesion - Bethesda Hospital, Wuppertal, Germany
5. Faculty of Medicine and Health Sciences, University of Nottingham, Nottingham, UK