Siff KS, Finkler AE. False-positive barbiturate test in urine owing to phenytoin and 5-(p-hydroxyphenyl)-5-phenylhydantoin. Clin Chem. 1988;34(6):1359-1360.
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Siff KS, Finkler AE. False-positive barbiturate test in urine owing to phenytoin and 5-(p-hydroxyphenyl)-5-phenylhydantoin. Clin Chem. 1988;34(6):1359-1360.