1. U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Division of Respiratory Disease Studies. Work-related lung disease Surveillance Report 2007. DHHS NIOSH Publication No. 2008-143a; 2008. Available from: http://www.cdc.gov/niosh/docs/2008-143/pdfs/2008-143a-i.pdf