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. 2016 Apr 18;5:14. doi: 10.1186/s13756-016-0113-8

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© Dik et al. 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. 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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Fig. 1 — Study regions in north of the Netherlands (postal codes 9xxx; n = 36,747) and north-west Germany (postal codes 26xxx; n = 18,374)