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Walk the evidence base by book and chapter — the raw source passages that ground Ask, Differential, and the rest.

1 passage

abstractpubmed· Abstract 2020· item PMID:32422096

Supplementation with vitamin D plus calcium reduces fracture risk; vitamin D alone does not. SOURCE CITATION: Yao P, Bennett D, Mafham M, et al. Vitamin D and calcium for the prevention of fracture: a systematic review and meta-analysis. JAMA Netw Open. 2019;2:e1917789. 31860103.