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\bibitem{deBacker_etal2008} {\textquotedblleft}\textit{Novel imaging techniques using computer methods for the evaluation of the upper airway in patients with sleep-disordered breathing: a comprehensive review}{\textquotedblright}. de Backer JW, Vos WG, Verhulst SL, de Backer W, Sleep medicine reviews \textbf{12}, 437 (2008).   http://doi.org/10.1016/j.smrv.2008.07.009

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