1. Centers for Disease Control and Prevention (2002) Prevalence of self-reported arthritis or chronic joint symptoms among adults-United States, 2001. MMWR 51:948–950
2. Centers for Disease Control and Prevention (2003) Public Health and aging: projected prevalence of self-reported arthritis or chronic joint symptoms among persons aged ≥65 years-United States, 2005–2030. MMWR 52:489–491
3. Population Projections Bureau, Population Division, U.S. Census Bureau: Summary files. (NP-T3) Projections of the total resident population by 5-year age groups, and sex with special age categories: middle series. Available at http://www.census.gov/population/www/projections/natsum-T3.html
4. Centers for Disease Control and Prevention (1997) Health risks in America: gaining insight from the Behavioral Risk Factor Surveillance Survey System. Atlanta, GA: US Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention
5. Gentry EM, Kalsbeek WD, Hogelin GC, Jones JT, Gaines KL, Forman MR, Marks JS, Trowbridge FL (1985) The behavioral risk factor surveys: II design, methods, and estimates from combined state data. Am J Prev Med 1:9–14