A 50-yeаr-оld Cаucаsian wоman presents tо your office with morning joint stiffness mostly in her feet and hands that lasts up to 2 hours after starting her day. She reports this happened about a month ago, and her wrists were very sore, but then she seemed to get better. She also reports feeling tired lately; her clothes feel looser, and sometimes she feels that she may be running a fever. Your exam shows swelling and warmth in the MCPs and PIPs of both hands. Based on this history and symptoms, what is your most likely diagnosis?