Treatment of vitamin D deficiency increases lower limb muscle strength in institutionalized older people independently of regular physical activity: a randomized double-blind controlled trial - Moreira-Pfrimer, Linda Denise Fernandes; Pedrosa, Márcia A. C.; Teixeira, Luzimar Raimundo; Lazaretti-Castro, Marise (Annals of Nutrition & Metabolism, 2009)