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Skwarek, M., Heschel, B., Fantana, J., & Aringer, M. (2013). fRI0008 Evidence for increased activity of interleukin-6 (IL-6) in seropositive rheumatoid arthritis (RA+), and differential tumour necrosis factor (TNF) receptor expression between ra+ and seronegative ra.. Annals of the rheumatic diseases, 72, A371. http://access.bl.uk/ark:/81055/vdc_100137783767.0x00005a