Vitamin B12 and folate deficiency in later life. (Age and ageing, 2004)

(untitled) - Clarke, R; Grimley Evans, J; Schneede, J; Nexo, E; Bates, C; Fletcher, A; Prentice, A; Johnston, C; Ueland, P; Refsum, H; Sherliker, P; Birks, J; et al.