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Marple, B; Roland, P; Benninger, M. Safety review of benzalkonium chloride used as a preservative in intranasal solutions: an overview of conflicting data and opinions. Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery. 2004, 130 (1): 131–41. PMID 14726922. doi:10.1016/j.otohns.2003.07.005.