K. Agin, M. Emam Hadi, and B. Mostafazadeh, “Status of Airway Reactivity among Small Airway Diseases with Regular Users Substance Abuse of Inhaling Opium; Preliminary Results of a Survey of Indirect Provocation Test”, Int J Med Toxicol Forensic Med, vol. 4, no. 3(Summer), pp. 83–90, Sep. 2014.