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Clinical significance of rheumatoid factors in early rheumatoid arthritis: results of a follow up study.
  1. D van Zeben,
  2. J M Hazes,
  3. A H Zwinderman,
  4. A Cats,
  5. E A van der Voort,
  6. F C Breedveld
  1. Department of Rheumatology, University Hospital, Leiden, The Netherlands.

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