maziar mahjoubifard anesthesiologist, department of anesthesiology, zahedan university of medical sciences, zahedan, iran alireza jahangiri fard fellowship of cardiac anesthesia, tracheal diseases research center, national research institute of tuberculosis and lung diseases (nritld) ,shahid beheshti university of medical science, tehran, iran majid golestani eraghi fellowship of intensive care, department of anesthesiology, masih daneshvari hospital, shahid beheshti university of medical science, tehran, iran shahram amini anesthesiologist, department of anesthesiology, mashhad university of medical sciences, mashhad, iran seyed mohammadreza hashemian fellowship of intensive care, national research institute of tuberculosis and lung diseases (nritld), masih daneshvari hospital, shahid beheshti university of medical sciences, tehran, iran. behrooz farzanegan fellowship of intensive care, national research institute of tuberculosis and lung diseases (nritld), masih daneshvari hospital, shahid beheshti university of medical sciences, tehran, iran.

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