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With the introduction of methotrexate, biological disease-modifying antirheumatic drugs (bDMARDs), and targeted synthetic DMARDs (tsDMARDs), the disease activity of patients with rheumatoid arthritis has been dramatically ameliorated. However, these drugs have strong immunosuppressive effects and can cause reactivation of hepatitis B virus (HBV) in patients with resolved HBV infection. Corticosteroids or immunosuppressants used for other connective tissue diseases or vasculitis also carry a risk of inducing reactivation of HBV. Therefore