A 56-year-old woman presents to her physician complaining of weight gain and joint problems.She is increasingly having difficulty walking up stairs and manipulating her fingers.Fingers in both hands as well as knees on both legs are equally painful and stiff.The symptoms have been getting progressively worse over the past 6 months.Rheumatoid factor is elevated,and antinuclear antibodies are not detected.Complement levels in her joints are decreased.This woman most likely has:

rheumatoid arthritis.

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