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. 2015 Nov 14;15:522. doi: 10.1186/s12879-015-1250-z

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© Stein et al. 2015

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. 4 — Spatial recruitment and commuting network structure. a Peer recruitment within The Netherlands and (between) Belgium. Arrows indicate recruitment between provinces and circles recruitment within a province. b Commuting network: directions that participants daily commute to work or study. Arrows indicate commuting across provinces, and circles commuting within a province. Sizes of arrows and circles are weighted for the total number of recruitments/commuters, with darker colours/larger circles indicating higher proportions. The maps were created with a shapefile (.shp file) that was extracted from GADM, an online geographic database of global administrative areas that is freely available for academic and other non-commercial use [45]