1. Faculty of Rehabilitation, Jozef Pilsudski University of Physical Education, Warsaw, Poland
2. Department of Research, University of Maryland Rehabilitation and Orthopaedic Institute, Baltimore, Maryland, USA
3. Department of Neurology, VA Maryland Healthcare System, Baltimore, Maryland, USA
4. Department of Neurology, University of Maryland Rehabilitation and Orthopaedic Institute, Baltimore, Maryland, USA
5. Department of Neurology, University of Maryland School of Medicine, Baltimore, Maryland, USA
6. Clinical Specialist, Warsaw, Poland