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. 2020 Jan 17;17:8. doi: 10.1186/s12986-020-0427-7

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© The Author(s). 2020, corrected publication 2021

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. 1 — Typical selected reaction monitoring chromatogram of 10 ng/mL 25(OH)D₃, 10 ng/mL 3-epi-25(OH)D₃ (a), 10 ng/mL 25(OH)D₂ and 10 ng/mL 3-epi-25(OH)D₂ (b) in serum