Urine testing for norcodeine, norhydrocodone, and noroxycodone facilitates interpretation and reduces false negatives

Edward J. Cone, Anne Zichterman, Rebecca Heltsley, David L. Black, Beverly Cawthon, Tim Robert, Frank Moser, Yale H. Caplan

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Pharmacology, Toxicology and Pharmaceutical Science

Biochemistry, Genetics and Molecular Biology

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