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Nagashima, T., Iwamoto, M. & Minota, S. Moderate incidence of prior rheumatoid arthritis in patients with polymyositis and dermatomyositis. Clin Rheumatol 30, 875–876 (2011). https://doi.org/10.1007/s10067-011-1754-x
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DOI: https://doi.org/10.1007/s10067-011-1754-x