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Foell D, Wulffraat N, Wedderburn LR, Wittkowski H, Frosch M, Gerss J, Stanevicha V, Mihaylova D, Ferriani V, Tsakalidou FKanakoudi, Foeldvari I, Cuttica R, Gonzalez B, Ravelli A, Khubchandani R, Oliveira S, Armbrust W, Garay S, Vojinovic J, Norambuena X, Gamir MLuz, Garc\'eda-Consuegra J, Lepore L, Susic G, Corona F, Dolezalova P, Pistorio A, Martini A, Ruperto N, Roth J. Methotrexate withdrawal at 6 vs 12 months in juvenile idiopathic arthritis in remission: a randomized clinical trial. JAMA 2010;303(13):1266-73.\par \par Vilca I, Munitis PGarcia, Pistorio A, Ravelli A, Buoncompagni A, Bica B, Campos L, H\'e4fner R, Hofer M, Ozen S, Huemer C, Bae SCheol, Sztajnbok F, Arguedas O, Foeldvari I, Huppertz HIko, Gamir MLuz, Magnusson B, Dressler F, Uziel Y, van Rossum MAJ, Hollingworth P, Cawkwell G, Martini A, Ruperto N. Predictors of poor response to methotrexate in polyarticular-course juvenile idiopathic arthritis: analysis of the PRINTO methotrexate trial. Ann Rheum Dis 2010;69(8):1479-83.\par \par }