1 Department of Neurosurgery, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran.
2 Department of Neurosurgery, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran; Student Research Committee, Shiraz University of Medical Sciences, Shiraz, Iran.
3 Health Policy Research Center, Institute of Health, Shiraz University of Medical Sciences, Shiraz, Iran.
4 Department of Neurosurgery, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran. Electronic address: [email protected].