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Valkenburg HA, Ball J, Burch TA, Bennett PH, Lawrence JS.Valkenburg HA, et al. Among authors: lawrence js.Ann Rheum Dis. 1966 Nov;25(6):497-508. doi: 10.1136/ard.25.6.497.Ann Rheum Dis. 1966.PMID: 5954313Free PMC article.No abstract available.