Standard&Poor's Ratings Services confirmed its 'AA-/A-1+' rating on California Health Facilities Financing Authority's (Adventist Health System/West) series 1991A and 1991B variable-rate demand obligation revenue bonds, due to the bank facility being extended to Dec. 15, 2015. The long-term and short-term components of the rating are based on the rating on the letter of credit provider, U.S. Bank National Association. Criteria: Methodology And Assumptions: Approach To Evaluating Letter Of Credit-Supported Debt, July 6, 2009