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Elnaggar, Y. S. R., Etman, S. M., Abdelmonsif, D. A., & Abdallah, O. Y. (2015). Intranasal Piperine-Loaded Chitosan Nanoparticles as Brain-Targeted Therapy in Alzheimer’s Disease: Optimization, Biological Efficacy, and Potential Toxicity. Journal of Pharmaceutical Sciences, 104(10), 3544–3556. doi:10.1002/jps.24557 
10.1002/jps.24557