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. 2021 Oct 2;21:432. doi: 10.1186/s12887-021-02906-7

Fig. 1.

Fig. 1

The data of age and serum vitamin D (25(OH)D) level showed almost the patients of all age were serum vitamin D less than 30 ng/ml, related with the prevalence of hypovitaminosis D 71%. The older age trend to decrease the level of serum vitamin D