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

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Sang-Won Lee, Hee-Jin Park, Beom K Kim, Kwang-Hyub Han, Soo-Kon Lee, Seung U Kim^*^† and Yong-Beom Park^*^†

* Corresponding authors: Seung U Kim ksukorea@yuhs.ac - Yong-Beom Park yongbpark@yuhs.ac
† Equal contributors

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