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Objectives
The development of rheumatoid arthritis (RA) has been classified into 6 phases A–F according to the present risk factors in sequence of genes, environments, autoimmunity, arthralgia and joint swelling. To clarify the ultrasound synovitis scores in at‐risk patients (phases C–E) and RA (phase F).
Methods
Patients who had been experiencing hand joint symptoms for at least 6 weeks and asymptomatic...