1. School of Medicine, Wayne State University, Detroit, MI, USA
2. Student Research Committee, Clinical Research Development Center, Taleghani and Imam Ali Hospital, Kermanshah University of Medical Sciences, Kermanshah, Iran
3. Department of Pathology, Kermanshah University of Medical Sciences, Taleghani Hospital, Kermanshah, Iran
4. Neurosurgery Department of Neurosurgery, Kermanshah University of Medical Sciences, Kermanshah, Iran
5. Neurosurgery, Department of Neurological Surgery, Barrow Neurological Institute, St. Joseph’s Hospital and Medical Center, Phoenix, AZ, USA