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Seikei Geka to Saigai Geka (Orthop Traumatol) 69: 897-901, 2020 (in Japanese)."},{"key":"9","doi-asserted-by":"crossref","unstructured":"9. Abe A, Wakaki K, Ishikawa H, Ito S, Murasawa A. A case of rheumatoid arthritis with methotrexate related lymphoproliferative diseases of the knee. Mod Rheumatol 28: 550-554, 2018.","DOI":"10.3109\/14397595.2015.1115160"},{"key":"10","doi-asserted-by":"crossref","unstructured":"10. Emkey RD, Ragsdale BD, Ropes MW, Miller W. A case of lymphoproliferative disease presenting as juvenile rheumatoid arthritis. Diagnosis by synovial fluid examination. Am J Med 54: 825-828, 1973.","DOI":"10.1016\/0002-9343(73)90072-7"},{"key":"11","doi-asserted-by":"crossref","unstructured":"11. Menon N, Madhok R. Symmetrical polyarthritis is not always rheumatoid. Ann Rheum Dis 53: 631-632, 1994.","DOI":"10.1136\/ard.53.10.631"},{"key":"12","doi-asserted-by":"crossref","unstructured":"12. Martin VM, Bennett RM, Hughes GR, Holt PJ. Lymphosarcomatous arthropathy. 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Agrawal K, Agrawal N, Levin M. Primary synovial diffuse large B-cell lymphoma presenting as loosening of prosthetic joint: a case report and review of literature. World J Oncol 10: 181-185, 2019.","DOI":"10.14740\/wjon1213"},{"key":"17","doi-asserted-by":"crossref","unstructured":"17. Kuramoto N, Saito S, Fujii T, et al. Characteristics of rheumatoid arthritis with immunodeficiency-associated lymphoproliferative disorders to regress spontaneously by the withdrawal of methotrexate and their clinical course: a retrospective, multicenter, case-control study. Mod Rheumatol 32: 24-31, 2022.","DOI":"10.1080\/14397595.2021.1879362"},{"key":"18","doi-asserted-by":"crossref","unstructured":"18. Inui Y, Matsuoka H, Yakushijin K, et al. Methotrexate-associated lymphoproliferative disorders: management by watchful waiting and observation of early lymphocyte recovery after methotrexate withdrawal. 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