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Fall prevention with supplemental and active forms of vitamin D: a meta-analysis of randomised controlled trials.[J].H A Bischoff-Ferrari;B Dawson-Hughes;H B Staehelin;J E Orav;A E Stuck;R Theiler;J B Wong;A Egli;D P Kiel;J Henschkowski.BMJ: British Medical Journal.2009, 7725

