References
- Helmick CG, Felson DT, Lawrence RC, et al. Estimates of the prevalence of arthritis and other rheumatic conditions in the United States. Arthritis Rheum 2008;58:15-25
- Rasch E, Hirsch R, Paulose-Ram R, et al. Prevalence of rheumatoid arthritis in persons 60 years of age and older in the United States: effect of different methods of case classification. Arthritis Rheum 2003;48:917-26
- Hurst NP, Kind P, Ruta D, et al. Measuring health-related quality of life in rheumatoid arthritis: validity, responsiveness and reliability of euroqol (EQ-5D). Brit J Rheumatol 1997;36:551-9
- Woolf AD, Pfleger B. Burden of major musculoskeletal conditions. Bull World Health Organ 2003;81:646-56
- BioPortfolio. Study of people with rheumatoid arthritis who require joint surgery in the hand. http://www.bioportfolio.com/resources/trial/118386/Study-Of-People-With-Rheumatoid-Arthritis-Who-Require-Joint-Surgery-In-The.html. Accessed February 28, 2012
- Rossi P, Freeman H, Lipsey M. Evaluation: a systematic approach. Thousand Oaks, CA: Sage Productions, 1989
- Myasoedova E, Davis JM, Crowson CS, et al. Epidemiology of rheumatoid arthritis: rheumatoid arthritis and mortality. Curr Rheumatol Report 2010;12:379-85
- Mellemkjaer L, Linet MS, Gridley G, et al. Rheumatoid arthritis and cancer risk. Eur J Cancer 1996;32:1753-7
- Charlson M, Szatrowski TP, Peterson J, et al. Validation of a combined comorbidity index. J Clin Epidemiol 1994;47:1245-51
- de Groot V, Beckerman H, Lankhorst GJ, et al. How to measure comorbidity: a review of available methods. J Clin Epidemiol 2003;56:221-9
- Deyo RA, Cherkin DC, Ciol MA. Adapting a clinical comorbidity index for use with ICD-9-CM administrative databases. J Clin Epidemiol 1992;45:613-9
- Cabral D, Katz JN, Weinblatt ME, et al. Development and assessment of indicators of rheumatoid arthritis severity: results of a delphi panel. Arthritis Rheum 2005;53:61-6
- Ting G, Schneeweiss S, Scranton R, et al. Development of a healthcare utilisation data-based index for rheumatoid arthritis severity: a preliminary study. Arthritis Res Ther 2008;10:R95
- Ting G, Schneeweiss S, Katz JN, et al. Performance of a rheumatoid records-based index of severity. J Rheumatol 2005;32:1679-87
- Sato M, Schneeweiss S, Scranton R, et al. The validity of a rheumatoid arthritis medical records-based index of severity compared with the DAS28. Arthritis Res Ther 2006;8:R57
- Wilson NJ, Kizer KW. The VA healthcare system: an unrecognized national safety net. Health Affairs 1997;16:200-4