1. STUDENT SCIENTIFIC ASSOCIATION AT THE DEPARTMENT OF NEUROLOGY, INSTITUTE OF MEDICAL SCIENCES, UNIVERSITY OF OPOLE, OPOLE, POLAND
2. CLINICAL DEPARTMENT OF GERIATRICS, INSTITUTE OF MEDICAL SCIENCES, UNIVERSITY OF OPOLE, OPOLE, POLAND
3. DEPARTMENT OF NEUROLOGY, INSTITUTE OF MEDICAL SCIENCES, UNIVERSITY OF OPOLE, OPOLE, POLAND; DEPARTMENT OF NEUROLOGY, ST. JADWIGA REGIONAL SPECIALIZED HOSPITAL, OPOLE, POLAND