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Ku HY, Shon JH, Liu KH, Shin JG, Bae SK. Liquid chromatography/tandem mass spectrometry method for the simultaneous determination of vardenafil and its major metabolite, N-desethylvardenafil, in human plasma: application to a pharmacokinetic study. J Chromatogr B Analyt Technol Biomed Life Sci. 2009 Jan 01;877(1-2):95–100. doi: 10.1016/j.jchromb.2008.11.015. PMID: 19042162. |