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. 2014 Apr 19;23(7):589–599. doi: 10.1136/bmjqs-2013-002223

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions

This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 3.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/3.0/

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Geographical distribution of American College of Surgeons National Surgical Quality Improvement Project (ACS NSQIP) participating sites. Number of sites by state, region and country included in the January 2013 NSQIP semi-annual report. Reprinted by permission of ACS NSQIP.