病程极短(≤16周)的495例未分化关节炎患者随访2年的结局   SAT0055 TWO-YEAR OUTCOME IN 495 PATIENTS WITH UNDIFFERENTIATED ARTHRITIS OF VERY SHORT DURATION G. H. Brinkmann1,*, E. S. Norli2, T. K. Kvien3, A. J. Haugen1, L. Grø