Annals of internal medicine
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This article has been corrected. The original version (PDF) is appended to this article as a Supplement.
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This article has been corrected. The original version (PDF) is appended to this article as a Supplement.
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This article has been corrected. The original version (PDF) is appended to this article as a Supplement.
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This article has been corrected. The original version (PDF) is appended to this article as a Supplement.
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This article has been corrected. The original version (PDF) is appended to this article as a Supplement.