title: Is Nørgaards's radiological sign for early rheumatoid arthritis reliable? An epidemiological approach.
mesh_terms: D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000175:diagnosis / Q000000981:diagnostic imaging*; D003951:Diagnostic Errors; D005260:Female; D005384:Finger Joint; D006225:Hand / Q000000981:diagnostic imaging; D006801:Humans; D008297:Male; D008722:Methods; D008875:Middle Aged; D011859:Radiography; D012217:Rheumatoid Factor; D012494:Sampling Studies; D012698:Serologic Tests
chemical_list: D012217:Rheumatoid Factor