The wrong reference was given at the end of the letter on treatment of polymyositis in the July issue (1). The correct reference is BUNCH TW. Longterm follow-up of azathioprine for polymyositis. Arthritis Rheum. 1980;23:658.
Correction: Reference for Polymyositis Study. Ann Intern Med. ;93:513. doi: 10.7326/0003-4819-93-3-513_3
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Published: Ann Intern Med. 1980;93(3):513.
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