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\bibitem{DeBacker_etal2011} {\textquotedblleft}\textit{Functional imaging using computer methods to compare the effect of salbutamol and ipratropium bromide in patient-specific airway models of COPD}{\textquotedblright}. De Backer LA, Vos WG, Salgado R, de Backer JW, Devolder A, Verhulst SL, Claes R, Germonpr{\'e} PR, de Backer WA, International journal of chronic obstructive pulmonary disease \textbf{6}, 637 (2011).   http://doi.org/10.2147/COPD.S21917

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