Crossing the valley of death : bringing promising medical countermeasures to BioShield : 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, first session, on examining promising medical countermeasures to BioShield, focusing on the Project BioShield Act of 2004, and the administration's priority to have an appropriate armamentarium of medical countermeasures as a critical aspect of the response and recovery component of the president's strategy biodefense for the 21st century, June 9, 2005.