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\bibitem{DeBacker_etal2012} {\textquotedblleft}\textit{The acute effect of budesonide/formoterol in COPD : a multi-slice computed tomography and lung function study}{\textquotedblright}. De Backer LA, Vos W, de Backer J, Van Holsbeke C, Vinchurkar S, de Backer W, European Respiratory Journal \textbf{40}, 298 (2012).   http://doi.org/10.1183/09031936.00072511

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