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. 2017 Jun 30;7(7):624–628. doi: 10.1177/2192568217699387

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© The Author(s) 2017

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 License (http://www.creativecommons.org/licenses/by-nc-nd/4.0/) which permits non-commercial use, reproduction and distribution of the work as published without adaptation or alteration, without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 6. — Average incidence of patients undergoing single-level PLIF with/without rhBMP-2 by region from 2005 to 2011 (per 100 000 patients). *P < .05, **P < .01.