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. 2015 May 20;22(6):720–729. doi: 10.1111/acem.12688

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© 2015 The Authors. Academic Emergency Medicine published by Wiley Periodicals, Inc. on behalf of Society for Academic Emergency Medicine.

This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Relative change in ED length of stay in the 6 months following the ED process improvement program implementation period compared with the same period in the 2 years prior to program implementation for each participating site.