1. Department of Neurology, Faculty of Medicine, Sakarya University, Sakarya, Turkey
2. Department of Neurology, Faculty of Medicine, Yildirim Beyazid University, Ankara, Turkey
3. Department of Neurology, Faculty of Medicine, Ataturk University, Erzurum, Turkey
4. Department of Biochemistry, Faculty of Medicine, Ataturk University, Erzurum, Turkey