Maintaining purpose in a changing environment.
D000553:Ambulatory Care / Q000639:trends; D000556:Ambulatory Surgical Procedures / Q000639:trends; D003695:Delivery of Health Care / Q000639:trends*; D004632:Emergency Medical Services / Q000639:trends; D006123:Group Practice / Q000639:trends; D006279:Health Maintenance Organizations / Q000639:trends; D014481:United States