REFERENCES
1. Verstappen SM, Bijlsma JW, Verkleij H, Buskens E, Blaauw AA, ter Borg EJ, et al. Utrecht Rheumatoid Arthritis Cohort Study Group. Overview of work disability in rheumatoid arthritis patients as observed in cross-sectional and longitudinal surveys. Arthritis Rheum. 2004; 51:488–97.
2. Son KM, Jung DM, Kim YB, Han JS, Seo YI, Jung YO, et al. Comparison Korean National Health Insurance Reimbursement and Other Guidelines for TNF-alpha Blocker in Rheumatoid Arthritis. J Rheum Dis. 2012; 19:334–40.
3. Son KM, Jung YO, Kim IJ, Kim BJ, Lee SY, Mun SY, et al. Clinical Characteristics of Korean Rheumatoid Arthritis Patients with Indications for TNF-alpha Blocker. J Rheum Dis. 2013; 20:356–60.
4. Won S, Sung YK, Cho SK, Choi CB, Koh EM, Kim SK, et al. Prediction for TNF Inhibitor Users in RA Patients According to Reimbursement Criteria Based on DAS28. J Rheum Dis. 2014; 21:64–73.
5. Lethaby A, Lopez-Olivo MA, Maxwell L, Burls A, Tugwell P, Wells GA. Etanercept for the treatment of rheumatoid arthritis. Cochrane Database Syst Rev. 2013; 5:CD004525.
6. Wolfe F, Michaud K, Pincus T, Furst D, Keystone E. The disease activity score is not suitable as the sole criterion for initiation and evaluation of anti-tumor necrosis factor therapy in the clinic: discordance between assessment measures and limitations in questionnaire use for regulatory purposes. Arthritis Rheum. 2005; 52:3873–9.
7. Bakker MF, Jacobs JW, Kruize AA, van der Veen MJ, van Booma-Frankfort C, Vreugdenhil SA, et al. Misclassification of disease activity when assessing individual patients with early rheumatoid arthritis using disease activity indices that do not include joints of feet. Ann Rheum Dis. 2012; 71:830–5.
8. Leeb BF, Haindl PM, Maktari A, Nothnagl T, Rintelen B. Disease activity score-28 values differ considerably depending on patient's pain perception and sex. J Rheumatol. 2007; 34:2382–7.
9. Ranzolin A, Brenol JC, Bredemeier M, Guarienti J, Rizzatti M, Feldman D, et al. Association of concomitant fibromyalgia with worse disease activity score in 28 joints, health assessment questionnaire, and short form 36 scores in patients with rheumatoid arthritis. Arthritis Rheum. 2009; 61:794–800.
10. www.cpg.or.kr/files/guideline/1384324864374.xml