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Page last updated at 09:01 GMT, Monday, 21 September 2009 10:01 UK

'Wake up call' needed on dementia

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On World Alzheimer's Day, new findings from Kings College London show that the number of people suffering from dementia is set to double to 65 million by 2030, and to double again by 2050.

Dr Robert Stewart, from King's College, explains the new findings, and science correspondent Tom Feilden, reports on the breakthrough, earlier this month, of three new genes identified by researchers in the UK and France.

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