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J. Eichhorst, M. Etter, J. Lepage, and D.C. Lehotay. Urinary screening for methylphenidate (Ritalin) abuse: a comparison of liquid chromatography-tandem mass spectrometry, gas chromatography-mass spectrometry, and immunoassay methods. Clinical Biochemistry 37: 175-183 (2004) 
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