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We would like to thank Dr Gillespy for pointing out the mistakes and omissions in our article. The number of patients in the non-myocardial infarction group in the Table should read ten. Also in the Table, the urine urea-creatinine ratio should be millimoles of urea per millimole of creatinine in urine. The text on page 439, the second column, the first paragraph, last line, should have read as follows: "There was a significant decrease (mean decrease 21%) in tubular reabsorption."