1. Imam Reza hospital, Department of neurosurgery Kermanshah University of Medical Sciences, Kermanshah, Iran
2. Department of Neurological Surgery, Barrow Neurological Institute, St. Joseph’s Hospital and Medical Center, Phoenix, AZ, USA
3. Department of neurosurgery, Kermanshah University of Medical Sciences, Kermanshah, Iran
4. Department of anesthesiology, Kermanshah University of Medical Sciences, Kermanshah, Iran
5. Clinical Research Development Center, Taleghani and Imam Ali Hospital, Kermanshah University of Medical Sciences, Kermanshah, Iran
6. nursing and midwifery school, Kermanshah University of Medical Sciences, Kermanshah, Iran
7. Imam Reza hospital, Kermanshah University of Medical Sciences, Kermanshah, Iran