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Bischoff, H.; Stähelin, H.B.; Urscheler, N.; Ehrsam, R.; Vonthein, R.; Perrig-Chiello, P.; Tyndall, A.; Teiler, R. (1998). Muscle strength and its relation to vitamin D metabolites in the elderly. Archives of physical medicine and rehabilitation(80), pp. 54-58. W.B. Saunders
