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Previous Volume 330:1627 June 2, 1994 Number 22 Next

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Variation in the Prothrombin-Time Ratio during Oral Anticoagulation . In the letter from Schuff-Werner, Schutz, and Gonska, the last sentence of the second paragraph should have read, "In the case of reagent A, a heparin concentration of more than 0.5 U per milliliter in the blood sample would have shown an INR value within the therapeutic range," not "less than 0.5 U," as printed. We regret the error.

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