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Huhn, Andrew S and Whitley, Penn and Bolin, B Levi and Dunn, Kelly E (2024) Fentanyl, heroin, methamphetamine, and cocaine analyte concentrations in urine drug testing specimens. JAMA Network Open, 7, (10), e2441063. https://doi.org/10.1001/jamanetworkopen.2024.41063.