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