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. 2019 Jun 11;59(4):1371–1378. doi: 10.1007/s00394-019-01989-4

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© The Author(s) 2019

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.

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Fig. 2 — Scatterplot of fractional iron absorption values (FIA) over plasma ferritin concentration with regression lines. The regression lines are derived from the model: salt + log (ferritin) + salt × log(ferritin). a On a logarithmic scale, b on the original scale. Black dots/line FeSO₄ and red dots/line Fe-picolinate. Slopes were not significantly different (p = 0.548)