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. 2019 Mar 15;6:2333794X19835661. doi: 10.1177/2333794X19835661

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© The Author(s) 2019

This article is distributed under the terms of the Creative Commons Attribution 4.0 License (http://www.creativecommons.org/licenses/by/4.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 2. — Seasonal variation in 25-hydroxyvitamin D (25(OH)D) concentrations. In the combined 3 cohorts, there was a seasonal variation in serum 25(OH)D concentrations, with the lowest concentrations measured in winter. Comparing the separate groups, the difference in 25(OH)D concentrations by season was, however, only seen in the patients with SLE (systemic lupus erythematosus), and not in the OI (osteogenesis imperfecta) or DMD (Duchenne muscular dystrophy) cohorts. The error bars indicate ±1 standard deviation.