1. Student Scientific Association at the Department of Neurology, Institute of Medical Sciences, University of Opole, 45-052 Opole, Poland
2. Clinical Department of Geriatrics, Stobrawskie Medical Center in Kup, 46-082 Kup, Poland
3. Department of Neurology, St. Jadwiga Provincial Specialist Hospital, Institute of Medical Sciences, University of Opole, 45-052 Opole, Poland