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Report of a Study Conducted by a Committee of the American Rheumatism Association: * This research has been supported in part by Grant No. A-308 from the National Institute of Arthritis and Metabolic Diseases. † A short account of this report was published in the Annals of the Rheumatic Diseases (1956), 13, 401-403. This article has been cited by other articles in PMC. | ||||