1. Department of Emergency Medicine, Imam Khomeini Hospital, Azadegan Avenue, Ahvaz Jundishapur University of Medical Sciences, P.O. Box 61936-73116, Ahvaz, Iran
2. Departement of Internal Medicine, Division of Pulmonology, Imam Khomeini Hospital, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
3. Department of Immunology, Ahvaz Jundishapour University of Medical Sciences, Ahvaz, Iran