1. Centre for Rehabilitation Research, örebro and Division of Physiotherapy, Neurotec Department, Karolinska Institutet, Karolinska University Hospital at Huddinge, Stockholm
2. Section of Neurology, Department of Clinical Neuroscience, Karolinska Institutet, Karolinska University Hospital at Huddinge, Stockholm
3. Division of Physiotherapy, Neurotec Department, Karolinska Institutet, Karolinska University Hospital at Huddinge, Stockholm, Sweden
4. Section of Neurology, Department of Clinical Neuroscience, Karolinska Institutet, Karolinska University Hospital at Huddinge, Stockholm, Sweden; Department of Applied Epidemiology, National Centre for Epidemiology, Carlos III Institute of Health, Madrid, Spain
5. Division of Physiotherapy, Neurotec Department and Section of Neurology, Department of Clinical Neuroscience, Karolinska Institutet, Karolinska University Hospital at Huddinge, Stockholm, Sweden