Letter: Rheumatology for clinicians.
D001022:Aortic Valve Insufficiency / Q000209:etiology*; D001172:Arthritis, Rheumatoid / Q000175:diagnosis / Q000188:drug therapy; D006801:Humans; D012217:Rheumatoid Factor / Q000032:analysis; D013167:Spondylitis, Ankylosing / Q000150:complications*
D012217:Rheumatoid Factor