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. 2015 Jun 22;5:10974. doi: 10.1038/srep10974

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This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Calcium supply in 1992 (a) and 2011 (c). Calcium deficiency risk in 1992 (b) and 2011 (d). Country boundaries were downloaded from the GADM Global Administrative Areas database (http://gadm.org/, Version 2, January 2012). Thematic mapping of Ca supply and deficiency risk was carried out in ArcGIS 10.2.1.