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. 2013 Dec 10;13:581. doi: 10.1186/1471-2334-13-581

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Copyright © 2013 Song et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), 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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The three participating Korean regions. Because of geographical proximity, the 2 provinces (Jeollabuk-do, Jeollanam-do), 1 metropolitan city (Gwangju), and 1 new town (Goyang) were classified into 3 regions (in Gray).