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Journal of Analytical Toxicology|January 30, 2010
Urine drug testing of chronic pain patients. II. Prevalence patterns of prescription opiates and metabolitesRebecca Heltsley, Anne Zichterman, David L Black, et al.
Forensic Science International|December 29, 2009
Urine testing for norcodeine, norhydrocodone, and noroxycodone facilitates interpretation and reduces false negativesEdward J Cone, Anne Zichterman, Rebecca Heltsley, et al.
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