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Qiao M, Guo X, Li F.Qiao M, et al. Among authors: guo x.J Chromatogr A. 2002 Apr 5;952(1-2):131-8. doi: 10.1016/s0021-9673(02)00086-9.J Chromatogr A. 2002.PMID: 12064525
Li K, Wang Y, Zhang L, Qin F, Guo X, Li F.Li K, et al. Among authors: guo x.J Chromatogr B Analyt Technol Biomed Life Sci. 2013 Sep 1;934:89-96. doi: 10.1016/j.jchromb.2013.06.033. Epub 2013 Jul 5.J Chromatogr B Analyt Technol Biomed Life Sci. 2013.PMID: 23911540
Lu Y, Li N, Deng Y, Zhao L, Guo X, Li F, Xiong Z.Lu Y, et al. Among authors: guo x.J Chromatogr B Analyt Technol Biomed Life Sci. 2015 Jul 1;993-994:75-80. doi: 10.1016/j.jchromb.2015.04.021. Epub 2015 May 6.J Chromatogr B Analyt Technol Biomed Life Sci. 2015.PMID: 26000860