Comparison of the efficacy and safety of methotrexate alone or in combination with leflunomide in the treatment of juvenile idiopathic arthritis: a double-blind, placebo-controlled... oleh Zahra Rezaieyazdi, Sahar Ravanshad, Mandana Khodashahi, Maliheh Bokaeian, Hassan Mehrad Majd, Masoumeh Salari