Dr Lynne Millar from the leading heart charity for young people, Cardiac Risk in the Young, has said that 80% of apparently healthy 14 to 35-year-olds who die from young sudden cardiac death will have shown no previous sign of heart defects.
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A third person has been charged with murder after four children died in a house fire in Walkden.
A blaze at a family home in Salford has claimed a fourth child victim.
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