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References
Article:Immune Complexes and Other Laboratory Features of Pleural Effusions: A Comparison of Rheumatoid Arthritis, Systemic Lupus Erythematosus, and Other Diseases
JAMES T. HALLA,
RALPH E. SCHROHENLOHER,
and JOHN E. VOLANAKIS
Ann Intern Med June 1, 1980 92:748-752; doi:10.1059/0003-4819-92-6-748