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Evans, M. E., Feola, D. J., & Rapp, R. P. (1999). Polymyxin B Sulfate and Colistin: Old Antibiotics for Emerging Multiresistant Gram-Negative Bacteria. Annals of Pharmacotherapy, 33(9), 960–967. doi:10.1345/aph.18426 
10.1345/aph.18426