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A randomised controlled trial investigating the effect of n-3 long-chain polyunsaturated fatty acid supplementation on cognitive and retinal function in cognitively healthy older people: the Older People And n-3 Long-chain polyunsaturated fatty acids (OPAL) study protocol [ISRCTN72331636]

Alan D Dangour email, Felicity Clemens email, Diana Elbourne email, Nicky Fasey email, Astrid E Fletcher email, Pollyanna Hardy email, Graham E Holder email, Felicia A Huppert email, Rosemary Knight email, Louise Letley email, Marcus Richards email, Ann Truesdale email, Madge Vickers email and Ricardo Uauy email

Nutrition Journal 2006, 5:20doi:10.1186/1475-2891-5-20

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