Ali Ç Turgut1, Walter A Hall2, Mehmet Turgut3,4. 1. Hacettepe University School of Medicine, Ankara, Turkey. 2. Department of Neurosurgery, SUNY Upstate Medical University, Syracuse, NY, 13210, USA. hallw@upstate.edu. 3. Department of Neurosurgery, Adnan Menderes University School of Medicine, Aydın, Turkey. 4. Department of Histology and Embryology, Adnan Menderes University Health Sciences Institute, Aydın, Turkey.