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. 2015 May 9;17(1):118. doi: 10.1186/s13075-015-0627-0

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© Exarchou et al.; licensee BioMed Central. 2015

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 cited. 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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Flow chart showing the process of identifying patients with a registered ankylosing spondylitis (AS) diagnosis according to the World Health Organization International Classification of Disease codes in the National Patient Register between 1967 and 2009 according to the base case and strict case definition.