1. Kochkin S. MarkeTrak VII: Hearing loss population top 31 million people. Hear Rev 2005; 12(7):16–29.
2. Lethbridge-Cejku M, Schiller JS, Bernadel L. Summary health statistics for U.S. adults: National Health Interview Survey. Vital and Health Statistics, 10 (222):1–151. Hyattsville, MD: National Center for Health Statistics, 2004.
3. National Center for Health Statistics. Provisional Report: Summary Health Statistics for U.S. Adults. National Health Interview Survey, 2004. Series 10, Number 228. Hyattsville, MD: National Center for Health Statistics, 2005.
4. Steinmetz E. Americans with Disabilities: 2002, Current Population Reports, P70-170. Washington, DC: U.S. Census Bureau, 2006.
5. Centers for Disease Control and Prevention. Vital and health statistics trends in the health of older Americans: United States, 1994. Washington, DC: US Department of Health and Human Services, 1995.