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. 2014 Sep 5;18(5):477. doi: 10.1186/s13054-014-0477-1

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© Roggenbach et al., licensee BioMed Central Ltd. 2014

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Bar chart indicating the number of cases of individuals with postoperative delirium, divided into groups with preoperative apnea-hypopnea index (AHI) values higher or lower than 19.