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WASHINGTON - NOVEMBER 07:  Comedian Joan Rivers speaks to reporters at the awards ceremony for the 11th Annual Mark Twain Prize on November 10, 2008 in Washington, DC. This year's Mark Twain Prize for American Humor was awarded posthumously to George Carlin.  (Photo by Brendan Hoffman/Getty Images)
WASHINGTON - NOVEMBER 07:  Comedian Joan Rivers speaks to reporters at the awards ceremony for the 11th Annual Mark Twain Prize on November 10, 2008 in Washington, DC. This year's Mark Twain Prize for American Humor was awarded posthumously to George Carlin.  (Photo by Brendan Hoffman/Getty Images)

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Clinic where Rivers stopped breathing investigated

Clinic where Joan Rivers stopped breathing is under investigation. CNN's Miguel Marquez reports.

Clinic where Rivers stopped breathing investigated

Clinic where Joan Rivers stopped breathing is under investigation. CNN's Miguel Marquez reports.