PMC:7589163 / 37816-38667 JSONTXT

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A Chinese 2019 prospective study analyzed a cohort of infants recording whether they received vitamin D daily supplementation (400–600 UI/die) up to 6 months of age, and reported the median time of the first RTI episode, which ended up being 60 days in infants without supplementation and longer than 6 months in infants with supplementation 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