**Author details**

Pinar Atukeren1 , Taner Tanriverdi2 and M. Ramazan Yigitoglu3

1 Istanbul University, Cerrahpasa Medical Faculty, Department of Biochemistry, Istanbul, Turkey

2 Istanbul University, Cerrahpasa Medical Faculty, Department of Neurosurgery, Istanbul, Turkey

3 Turgut Ozal University, Faculty of Medicine, Department of Biochemistry, Ankara, Turkey
