Evaluation of the relationship of xylazine and fentanyl blood concentrations among fentanyl-associated fatalities. - Hays, Hannah L.; Spiller, Henry A.; DeRienz, Rebecca T.; Rine, Natalie I.; Guo, Han-Tian; Seidenfeld, Meagan; Michaels, Nichole L.; Smith, Gary A. (Clinical Toxicology (15563650), 2024)