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. 2019 Nov 27;8(1):e134–e142. doi: 10.1016/S2214-109X(19)30457-7

Figure 1.

Figure 1

Study selection

25(OH)D=25-hydroxyvitamin D. *Some studies reported both mean 25(OH)D concentrations and prevalence of vitamin D deficiency, and some studies used more than one cutoff value.