Massachusetts General Hospital moved into the No. 1 spot on the 2012-13 U.S. News & World Report rankings of best hospitals in America last week, the first time in the 23-year history of the survey that the institution has received the distinction. Nine of Harvard Medical School's 16 affiliates were recognized for excellence in this year's U.S. News surveys, including Beth Israel Deaconess Medical Center, Brigham and Women's Hospital, Boston Children's Hospital, Dana Farber Cancer Institute, Joslin Diabetes Center, Massachusetts Eye and Ear Infirmary, Mass General, McLean Hospital and Spaulding Rehabilitation Hospital.