Standard&Poor's Ratings Services confirmed its 'A-1+' rating on Rochester, Minn.'s (Mayo Foundation) series 2000B hospital variable-rate demand obligation bonds, issued for the Mayo Clinic, due to the bank facility being extended to Jan. 6, 2016. The rating is based on the short-term rating on the liquidity facility provider, U.S. Bank National Assn. USPF Criteria: Bank Liquidity Facilities, June 22, 2007