May 1992

Error in Equation

Arch Intern Med. 1992;152(5):959. doi:10.1001/archinte.1992.00400170049009

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In the editorial entitled "Substandard Monitoring of Warfarin in North America" that appeared in the February 1992 issue of the ARCHIVES (1992;152:257-258), an error appeared in the equation on page 257, second column, line 40. The denominator of this equation appeared as "PR Control"; it should have appeared as "PT Control."

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