Roundtable on "Crisis in the ER--how can we improve emergency medical care?" : hearing before the Subcommittee on Bioterrorism and Public Health Preparedness of the Committee on Health, Education, Labor, and Pensions, United States Senate, One Hundred Ninth Congress, second session, on examining measures to improve emergency medical care, focusing on the need for change to continue providing quality emergency medical care when and where it is expected, September 27, 2006.