Affiliation: | 1. Department of Medicine, Division of Rheumatology, Helsinki University Central Hospital, P.O. Box 372, FIN-00029 HUS, Helsinki, Finland 2. Department of Rheumatology, P?ij?t-H?meen Central Hospital, Lahti, Finland 3. Department of Medicine, University of Helsinki and Helsinki University Central Hospital, Helsinki, Finland 4. Department of Internal Medicine, Centre for Rheumatic Diseases, Tampere University Hospital, Tampere, Finland
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