1. Lipsky PE. Chapter 314, Rheumatoid arthritis. Harrison's Principles of Internal Medicine c2008;17th ed. New York (USA): Mc Graw Hill. 2083-2092.
2. Pedersen M, Jacobsen S, Klarlund M, Frisch M. Socioeconomic status and risk of rheumatoid arthritis: a Danish case-control study. J Rheumatol 2006;33:1069-1074.
3. Visser H. Early diagnosis of rheumatoid arthritis. Best Pract Res Clin Rheumatol 2005;19:55-72.
4. Smolen JS, Landewé R, Breedveld FC, Dougados M, Emery P, Gaujoux-Viala C, Gorter S, Knevel R, Nam J, Schoels M, Aletaha D, Buch M, Gossec L, Huizinga T, Bijlsma JW, Burmester G, Combe B, Cutolo M, Gabay C, Gomez-Reino J, Kouloumas M, Kvien TK, Martin-Mola E, McInnes I, Pavelka K, van Riel P, Scholte M, Scott DL, Sokka T, Valesini G, van Vollenhoven R, Winthrop KL, Wong J, Zink A, van der Heijde D. EULAR recommendations for the management of rheumatoid arthritis with synthetic and biological disease-modifying antirheumatic drugs. Ann Rheum Dis 2010;69:964-975.
5. Lineker S, Badley E, Charles C, Hart L, Streiner D. Defining morning stiffness in rheumatoid arthritis. J Rheumatol 1999;26:1052-1057.
6. Lee SK. Causes and symptoms of rheumatoid arthritis. J Korean Med Assoc 1992;35:1213-1222.
7. Turesson C, O'Fallon WM, Crowson CS, Gabriel SE, Matteson EL. Extra-articular disease manifestations in rheumatoid arthritis: incidence trends and risk factors over 46 years. Ann Rheum Dis 2003;62:722-727.
8. Young A, Koduri G. Extra-articular manifestations and complications of rheumatoid arthritis. Best Pract Res Clin Rheumatol 2007;21:907-927.
9. Jeong SH. Interstitial Lung Diseases in Collagen Vascular Diseases. J Korean Med Assoc 2009;52:30-40.
10. Arnett FC, Edworthy SM, Bloch DA, McShane DJ, Fries JF, Cooper NS, Healey LA, Kaplan SR, Liang MH, Luthra HS, et al. The American Rheumatism Association 1987 revised criteria for the classification of rheumatoid arthritis. Arthritis Rheum 1988;31:315-324.
11. Sokka T, Pincus T. Joint counts to assess rheumatoid arthritis for clinical research and usual clinical care: advantages and limitations. Rheum Dis Clin North Am 2009;35:713-722.
12. Otterness IG. The value of C-reactive protein measurement in rheumatoid arthritis. Semin Arthritis Rheum 1994;24:91-104.
13. Park SH. New diagnostic method of rheumatoid arthritis. Korean J Med 2009;76:7-11.
14. Schellekens GA, Visser H, de Jong BA, van den Hoogen FH, Hazes JM, Breedveld FC, van Venrooij WJ. The diagnostic properties of rheumatoid arthritis antibodies recognizing a cyclic citrullinated peptide. Arthritis Rheum 2000;43:155-163.
15. Tedesco A, D'Agostino D, Soriente I, Amato P, Piccoli R, Sabatini P. A new strategy for the early diagnosis of rheumatoid arthritis: a combined approach. Autoimmun Rev 2009;8:233-237.
16. Devauchelle Pensec V, Saraux A, Berthelot JM, Alapetite S, Jousse S, Chales G, Thorel JB, Hoang S, Nouy-Trolle I, Martin A, Chiocchia G, Youinou P, Le Goff P. Ability of foot radiographs to predict rheumatoid arthritis in patients with early arthritis. J Rheumatol 2004;31:66-70.
17. Devauchelle-Pensec V, Berthelot JM, Jousse S, Samjee I, Josseaume T, Colin D, Chalés G, Thorel JB, Hoang S, Martin A, Youinou P, Le Goff P, Saraux A. Performance of hand radiographs in predicting the diagnosis in patients with early arthritis. J Rheumatol 2006;33:1511-1515.
18. Boutry N, Morel M, Flipo RM, Demondion X, Cotten A. Early rheumatoid arthritis: a review of MRI and sonographic findings. AJR Am J Roentgenol 2007;189:1502-1509.
19. Ostergaard M, Pedersen SJ, Dohn UM. Imaging in rheumatoid arthritis-status and recent advances for magnetic resonance imaging, ultrasonography, computed tomography and conventional radiography. Best Pract Res Clin Rheumatol 2008;22:1019-1044.
20. Majithia V, Geraci SA. Rheumatoid arthritis: diagnosis and management. Am J Med 2007;120:936-939.
21. Aho K, Palusuo T, Kurki P. Marker antibodies of rheumatoid arthritis: diagnostic and pathogenetic implications. Semin Arthritis Rheum 1994;23:379-387.
22. Banal F, Dougados M, Combescure C, Gossec L. Sensitivity and specificity of the American College of Rheumatology 1987 criteria for the diagnosis of rheumatoid arthritis according to disease duration: a systematic literature review and meta-analysis. Ann Rheum Dis 2009;68:1184-1191.