1 Scientific Circle of Neurology and Neurosurgery, Medical University of Gdansk, Dębinki 7, Gdansk 80- 952, Poland. Electronic address: abdullah.shuab@gumed.edu.pl.
2 Scientific Circle of Neurology and Neurosurgery, Medical University of Gdansk, Dębinki 7, Gdansk 80- 952, Poland.