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Kopeikina LT, Kamper EF, Koutsoukos V, Bassiakos Y, Stavridis I. Imbalance of tissue-type plasminogen activator (t-PA) and its specific inhibitor (PAI-1) in patients with rheumatoid arthritis associated with disease activity. Clinical rheumatology. 1997;16:254?260.\par \par }