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Schmalzing, Marc, Frank Behrens, Eva C. Schwaneck, Michaela Koehm, Gerd Greger, Holger Gnann, Harald Burkhardt, and Hans-Peter Tony. "Does Concomitant Methotrexate Confer Clinical Benefits in Patients Treated With Prior Biologic Therapy? Analysis of Data From a Noninterventional Study of Rheumatoid Arthritis Patients Initiating Treatment With Adalimumab." Medicine (Baltimore) 2020.

Schmalzing, Marc, et al. "Does Concomitant Methotrexate Confer Clinical Benefits in Patients Treated With Prior Biologic Therapy? Analysis of Data From a Noninterventional Study of Rheumatoid Arthritis Patients Initiating Treatment With Adalimumab." Medicine (Baltimore) 2020.