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Leflunomide increases the risk of silent liver fibrosis in patients with rheumatoid arthritis receiving methotrexate

Sang-Won Lee, Hee-Jin Park, Beom Kyung Kim, Kwang-Hyub Han, Soo-Kon Lee, Seung Up Kim* and Yong-Beom Park*

Arthritis Research & Therapy 2012, 14:R232  doi:10.1186/ar4075

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