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. 2015 Dec 7;10(12):e0144130. doi: 10.1371/journal.pone.0144130

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© 2015 Steinach 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 2 — Changes of 25-OH-vitamin D serum concentrations from 2007 to 2012, boxplots per month separate for male and female participants (refer to Table 3 for n per month).