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Kerstens, P.J.S.M., Boerbooms, A.M.T., Brummelkamp, E.P. et al. Long-term methotrexate in refractory rheumatoid arthritis; concurrent use of prednisone possibly improves drug-survival. Clin Rheumatol 13, 317–318 (1994). https://doi.org/10.1007/BF02249035
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DOI: https://doi.org/10.1007/BF02249035