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Zand, Vahid and Baradaranfar, Mohammadhossein and Dadgarnia, Mohammadhossein and Meybodian, Mojtaba and Vaziribozorg, Sedighe and Mandegari, Mohammad and Behniafard, Nasrin and Dehghani, Amrollah The Effect of Gelfoam Impregnated With Botulinum Toxin on Allergic Rhinitis Symptoms. Iranian Journal of Otorhinolaryngology.