1 Department of Anesthesiology and Pain Medicine, Amir Alam Hospital, Tehran University of Medical Sciences, Tehran, Iran.
2 Department of Anesthesiology and Pain Medicine, Amir Alam Hospital, Tehran University of Medical Sciences, Tehran, Iran; Department of Anesthesiology, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Iran.
3 Department of Medical Surgical Nursing, School of Nursing and Midwifery, Iranshahr University of Medical Sciences, Iranshahr, Iran; Student Research Committee, PhD(s), School of Nursing and Midwifery, Mashhad University of Medical Sciences, Mashhad, Iran.