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. 2015 Nov 30;10(11):e0139589. doi: 10.1371/journal.pone.0139589

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© 2015 Paget et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 1 — Note: The pig-density data for the Netherlands is from 2012 and for North Rhine-Westphalia it is from 2010 (the most recent data available for both countries).