Dr Eric Karran, from the charity Alzheimer's Research UK, said the exact connection between hearing loss and cognitive decline was still unknown.

BBC: Hearing loss in 'brain decline link'

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So even if WellPoint loses the local connection to customers, it could offset the loss by being the cheapest option.

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Charges taken in connection to a mandate to prefund retiree health care drove the loss in the latest quarter, but declining first-class and advertising mail volume were a drag on revenue.

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