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Oral fluid is a viable alternative for monitoring drug abuse: detection of drugs in oral fluid by liquid chromatography-tandem mass spectrometry and comparison to the results from urine samples from patients treated with Methadone or Buprenorphine.
Vindenes V, Yttredal B, Oiestad EL, Waal H, Bernard JP, Mørland JG, Christophersen AS. Vindenes V, et al. Among authors: yttredal b. J Anal Toxicol. 2011 Jan;35(1):32-9. doi: 10.1093/anatox/35.1.32. J Anal Toxicol. 2011. PMID: 21219701