Standard & Poor's Ratings Services said it revised its rating outlook to negative on debt issued by and for the Mayo Clinic, Minn.

At the same time, Standard & Poor's assigned its AA long-term rating to Mayo Clinic's $300 million series 2013 taxable bonds and affirmed its AA long-term ratings and AA/A-1-plus and AA/A-1 dual ratings on various debt issued for, or guaranteed by, the Mayo Clinic.

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