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Erb N, Haverland U, Harms DO, Escherich G, Janka-Schaub G.Erb N, et al.J Chromatogr B Analyt Technol Biomed Life Sci. 2003 Oct 25;796(1):87-94. doi: 10.1016/j.jchromb.2003.08.006.J Chromatogr B Analyt Technol Biomed Life Sci. 2003.PMID: 14552819Clinical Trial.