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. 2019 Jan 8;6(1):7. doi: 10.3390/children6010007

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Mean serum 25-hydroxyvitamin D (25(OH)D) measurements in randomized controlled trials (RCTs) assessing 400 IU/day vitamin D supplementation in 1–12-month-old infants. These measurements are the mean serum 25(OH)D at each timepoint in each experimental group which received 400 IU of vitamin D supplementation in these studies.