Hidden rheumatoid factor in seronegative nodular rheumatoid arthritis.
D001172:Arthritis, Rheumatoid / Q000276:immunology*; D002850:Chromatography, Gel; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D007074:Immunoglobulin G / Q000032:analysis; D007075:Immunoglobulin M / Q000032:analysis; D007592:Joint Diseases / Q000276:immunology*; D012217:Rheumatoid Factor / Q000032:analysis*
D007074:Immunoglobulin G; D007075:Immunoglobulin M; D012217:Rheumatoid Factor