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A randomised controlled trial investigating the effect of vitamin B12 supplementation on neurological function in healthy older people: the Older People and Enhanced Neurological function (OPEN) study protocol [ISRCTN54195799]

Alan D Dangour*, Elizabeth Allen, Robert Clarke, Diana Elbourne, Nicky Fasey, Astrid E Fletcher, Louise Letley, Marcus Richards, Ken Whyte, Kerry Mills and Ricardo Uauy

Nutrition Journal 2011, 10:22  doi:10.1186/1475-2891-10-22