1. Department of Neurosurgery, Yeditepe University School of Medicine, Istanbul, Turkey;
2. Yeditepe University School of Medicine, Microneurosurgery and Neuroanatomy Laboratory, Istanbul, Turkey;
3. Department of Neurosurgery, Istinye University, Faculty of Medicine, Istanbul, Turkey;
4. Department of Neurosurgery, Tepecik Research and Training Hospital, Izmir, Turkey; and
5. Department of Neurological Surgery, University of California, San Francisco, California
6. Department of Neurosurgery, Gazi University Faculty of Medicine, Ankara, Turkey;