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. 2019 Dec 21;14:458. doi: 10.1186/s13018-019-1517-y

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© The Author(s). 2019

Open Access This 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 — a, b The associations between serum calcium, serum 25(OH)D and lumbar bone mineral density stratified by sex. Age, race/ethnicity, body mass index, education, income to poverty ratio, physical activity, smoking behavior, and alcohol consumption were adjusted