Standard&Poor's Ratings Services confirmed its 'AA-/A-1+' rating on Illinois Finance Authority's series 2010B variable-rate demand obligation revenue bonds, issued for University of Chicago Medical Center, due to the bank facility being extended to Nov. 30, 2018. The long-term and short-term components of the rating are based on the ratings on the letter of credit provider, Wells Fargo Bank Northwest N.A. Criteria: Methodology And Assumptions: Approach To Evaluating Letter Of Credit-Supported Debt, Feb. 20, 2015