1.GUO Gang Department of Rheuma-tism and Immunity; Hebei Yiling Hospital; Hebei; Shijiazhuang 050091; China;
河北以岭医院风湿免疫科;
2.Objective To study the efficacy and safety of leflunomide (LEF) in the treatment of active rheuma-toid arthritis (RA) compared to methotrexate (MTX).