Influence of vitamin D supplementation on muscle strength and exercise capacity in South African schoolchildren: secondary outcomes from a randomised controlled trial (ViDiKids) by Cyrus Cooper, David A Jolliffe, Adrian R Martineau, Nicholas C Harvey, Keren Middelkoop, Jonathan C Y Tang, Robert J Wilkinson, Neil Walker, Lisa Micklesfield, Justine Stewart, Amy E Mendham, Stephanie Hemmings

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