1 Department of Neurosurgery, Orthopedics Research Center, Mazandaran University of Medical Sciences, Sari, Iran.
2 Department of Anesthesiology, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Iran.
3 Student Research Committee, Department of Medical-Surgical Nursing, School of Nursing and Midwifery, Mashhad University of Medical Sciences, Mashhad, Iran.