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APA Citation
Halldórsdóttir, H. D., Jónsson, T., Thorsteinsson, J., & Valdimarsson, H. (2000). a prospective study on the incidence of rheumatoid arthritis among people with persistent increase of rheumatoid factor. Annals of the rheumatic diseases, 59(2), 149–151. http://access.bl.uk/ark:/81055/vdc_100137787230.0x000061