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Maas R, Tan-Andreesen J, Schwedhelm E, Schulze F, Böger RH.Maas R, et al. Among authors: schulze f.J Chromatogr B Analyt Technol Biomed Life Sci. 2007 May 15;851(1-2):220-8. doi: 10.1016/j.jchromb.2007.01.020. Epub 2007 Jan 26.J Chromatogr B Analyt Technol Biomed Life Sci. 2007.PMID: 17296339