1. Department of Neurology & Algology; Gazi University Faculty of Medicine; Besevler 06510 Ankara Turkey
2. Department of Neurology, Balıkesir University; Balıkesir Turkey
3. Department of Medical Pharmacology; Gazi University Faculty of Medicine; Besevler Ankara Turkey
4. Department of Anaesthesiology & Algology; Gazi University Faculty of Medicine; Besevler Ankara Turkey
5. Neuropsychiatry Centre; Gazi University; Besevler 06510 Ankara Turkey
6. Department of Medical Pharmacology; Hacettepe University Faculty of Medicine; Sihhiye Ankara Turkey
7. Department of Neurology; David Geffen School of Medicine; University of California; Los Angeles; CA, USA