Many of Boston's medical facilities are associated with universities. The facilities in the Longwood Medical and Academic Area and in Massachusetts General Hospital are affiliated with Harvard Medical School. Tufts Medical Center (formerly Tufts-New England Medical Center), located in the southern portion of the Chinatown neighborhood, is affiliated with Tufts University School of Medicine. Boston Medical Center, located in the South End neighborhood, is the primary teaching facility for the Boston University School of Medicine as well as the largest trauma center in the Boston area; it was formed by the merger of Boston University Hospital and Boston City Hospital, which was the first municipal hospital in the United States.

Answer this question, if possible (if impossible, reply "unanswerable"): A lot of Bostond medical facilities are associated with what?
universities