1. Department of Neurology in Zabrze; Medical University of Silesia; ul. 3-go Maja 13-15; Zabrze; 41-800; Poland
2. ENT Department in Zabrze; Medical University of Silesia; Silesia; Poland
3. Department of Physiology in Zabrze; Medical University of Silesia; Silesia; Poland
4. Department of Biochemistry and Cell Biology; University of Rzeszow; ul. Zelwerowicza 4; Rzeszow; 35-601; Poland