1. Department of Neurology, University Hospital St. Ivan Rilsky – Sofia, Medical Universities of Sofia and Plovdiv, Bulgaria
2. Department of Neurology, University Hospital of Neurology and Psychiatry, Medical University, Sofia, Bulgaria
3. Department of Biomechanics, Institute of Mechanics, Bulgarian Academy of Sciences, Sofia, Bulgaria
4. Clinic of Functional Diagnostics of the Nervous System, Military Medical Academy, Sofia, Bulgaria
5. Department of Medical Rehabilitation and Occupational Therapy, Medical University, Sofia, Bulgaria