[The separability of 4 factors present in the serum in primary chronic rheumatism into 2 fractions by means of ultrasonics].
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SEIFERT
D001168:Arthritis; D001172:Arthritis, Rheumatoid / Q000097:blood*; D006801:Humans; D012216:Rheumatic Diseases / Q000097:blood*; D014465:Ultrasonics
ARTHRITIS, RHEUMATOID/blood; RHEUMATISM/blood