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\bibitem{deBacker_etal2009} {\textquotedblleft}\textit{Study of the variability in upper and lower airway morphology in Sprague-Dawley rats using modern micro-CT scan-based segmentation techniques}{\textquotedblright}. de Backer JW, Vos WG, Burnell P, Verhulst SL, Salmon P, de Clerck N, de Backer W, The anatomical record: advances in integrative anatomy and evolutionary biology \textbf{292}, 720 (2009).   http://doi.org/10.1002/ar.20877

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