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Avenell, A., J. Cook, G. Maclennan, and G. Macpherson. Vitamin D Supplementation to Prevent Infections: A Sub-study of a Randomised Placebo-controlled Trial in Older People (RECORD Trial, ISRCTN 51647438). 2007.

Avenell, A., et al. Vitamin D Supplementation to Prevent Infections: A Sub-study of a Randomised Placebo-controlled Trial in Older People (RECORD Trial, ISRCTN 51647438). 2007.