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Katz JN, Barrett J, Liang MH, Bacon AM, Kaplan H, Kieval RI, Lindsey SM, Roberts WN, Sheff DM, Spencer RT, Weaver AL, Baron JA. Sensitivity and positive predictive value of medicare part B physician claims for rheumatologic diagnoses and procedures. Arthritis Rheum 1997;40(9):1594-1600. [Abstract]