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Belal F, Walash M, El-Enany N, Zayed S.Belal F, et al. Among authors: zayed s.J Chromatogr B Analyt Technol Biomed Life Sci. 2013 Aug 15;933:24-9. doi: 10.1016/j.jchromb.2013.06.004. Epub 2013 Jun 28.J Chromatogr B Analyt Technol Biomed Life Sci. 2013.PMID: 23872160