Abstract:Background: Living at high latitudes is one of the risk factors for vitamin D deficiency in children. However, evidence on vitamin D improvement for this pediatric population to date is limited. This study aims at evaluating the association of different vitamin D intervention methods and outdoor activity on the vitamin D status of children in North China. Methods: In this observational study, a total of 55,925 children aged 1 month to 18 years old were recruited from pediatric outpatient departments from July … Show more
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