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Variability in free 25(OH) vitamin D levels in clinical populations.
Schwartz JB, Lai J, Lizaola B, Kane L, Weyland P, Terrault NA, Stotland N, Bikle D. Schwartz JB, et al. J Steroid Biochem Mol Biol. 2014 Oct;144 Pt A:156-8. doi: 10.1016/j.jsbmb.2013.11.006. Epub 2013 Nov 15. J Steroid Biochem Mol Biol. 2014. PMID: 24240067 Free PMC article. Review.