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\bibitem{deBacker_etal2013} {\textquotedblleft}\textit{Effect of high-dose N-acetylcysteine on airway geometry, inflammation, and oxidative stress in COPD patients}{\textquotedblright}. de Backer J, Vos W, Van Holsbeke C, Vinchurkar S, Claes R, Parizel PM, de Backer W, International Journal Of Chronic Obstructive Pulmonary Disease \textbf{8}, 569 (2013).   http://doi.org/10.2147/COPD.S49307

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