Wu F, Slawson MH, Johnson-Davis KL. Metabolic patterns of fentanyl, meperidine, methylphenidate, tapentadol and tramadol observed in urine, serum or plasma. J Anal Toxicol. 2017;41(4):289-299.
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Wu F, Slawson MH, Johnson-Davis KL. Metabolic patterns of fentanyl, meperidine, methylphenidate, tapentadol and tramadol observed in urine, serum or plasma. J Anal Toxicol. 2017;41(4):289-299.