1. Department of Pharmaceutical Technology, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey,
2. Department of Neurosurgery, Ankara Ataturk Research & Education Hospital, Ankara, Turkey,
3. Department of Biochemistry, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey, and
4. Department of Anatomy, Faculty of Medicine, Hacettepe University, Ankara, Turkey