title: Safety of some surgeries has not improved, study says.
authors.forename: Deborah
authors.initials: D
authors.lastname: Levenson
mesh_terms: D003625:Data Collection; D019992:Databases as Topic; D005544:Forecasting; D017052:Hospital Mortality / Q000639:trends*; D006801:Humans; D006278:Medicare; D017063:Outcome Assessment, Health Care / Q000639:trends; D017410:Practice Guidelines as Topic; D011787:Quality of Health Care; D013514:Surgical Procedures, Operative / Q000401:mortality* / Q000639:trends; D014481:United States