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BMJ Journals

NYK, Nordisk yrkesklassificering (Swedish classification system of occupations)

Socioeconomic status and the risk of developing rheumatoid arthritis: results from the Swedish EIRA study
C Bengtsson, B Nordmark, L Klareskog, I Lundberg, L Alfredsson

Annals of the Rheumatic Diseases Nov 2005, 64 (11) 1588-1594; DOI: 10.1136/ard.2004.031666