Development, Validation, and Application of a Novel Multi-Analyte High-Resolution Gas Chromatography-Mass Spectrometry (HRGC-MS) Method for the Quantification of Opioid Derivatives, Including Heroin, Morphine, and Fentanyl, in Biological Matrices with Enh. JOC [Internet]. 2025 Oct. 13 [cited 2025 Dec. 7];24(4s):1035-48. Available from: https://carcinogenesis.com/index.php/JOC/article/view/1391