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High-profile health care venture backed by Amazon, JPMorgan and Berkshire Hathaway shutters

SEATTLE — An ambitious effort by three of America’s most prominent companies and their high-powered executives to overhaul health care in the United States will shut down next month with little to show for it. Haven, created two years ago by Amazon, JPMorgan Chase and Berkshire Hathaway to address soaring health-care costs and improve patient […]