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Nguyen HP, Li L, Gatson JW, Maass D, Wigginton JG, Simpkins JW, Schug KA. Simultaneous quantification of four native estrogen hormones at trace levels in human cerebrospinal fluid using liquid chromatography–tandem mass spectrometry. Journal of Pharmaceutical and Biomedical Analysis. 2011 Mar;54(4):830–7. doi: 10.1016/j.jpba.2010.11.014. |