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. 2018 Jan 6;17:3. doi: 10.1186/s12937-018-0313-6

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© The Author(s). 2018

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. 2 — Density-equalizing mapping of socioeconomic features of vitamin D research of global vitamin D research activities (threshold: 30 vitamin D related articles). a Vitamin D articles were calculated in relation to GDP in 1000 bn USD. b Vitamin D articles were calculated in relation to the population in mill. Inhabitants