1. Centers for Disease Control and Prevention 2009 http://www.cdc.gov/arthritis/arthritis/index.htm
2. Prevalence of doctor-diagnosed arthritis and arthritis-attributable activity limitation: United States, 2003-2005;Hootman;MMWR Morb Mortal Wkly Rep,2006
3. Projections of US prevalence of arthritis and associated activity limitations;Hootman;Arthritis Rheum,2006
4. National and state medical expenditures and lost earnings attributable to arthritis and other rheumatic conditions: United States, 2003;Centers for Disease Control and Prevention;MMWR Morb Mortal Wkly Rep,2007
5. Prevalence of disabilities and associated health conditions among adults: United States, 1999;Centers for Disease Control and Prevention;MMWR Morb Mortal Wkly Rep,2001