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Vitamin D supplementation to patients with frequent respiratory tract infections: a post hoc analysis of a randomized and placebo-controlled trial

Crossref DOI link: https://doi.org/10.1186/s13104-015-1378-3

Published Online: 2015-08-30

Published Print: 2015-12

Update policy: https://doi.org/10.1007/springer_crossmark_policy

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