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Hefnawy MM, Sultan MA, Al-Shehri MM.Hefnawy MM, et al. Among authors: sultan ma.J Chromatogr B Analyt Technol Biomed Life Sci. 2007 Sep 1;856(1-2):328-36. doi: 10.1016/j.jchromb.2007.06.021. Epub 2007 Jun 29.J Chromatogr B Analyt Technol Biomed Life Sci. 2007.PMID: 17681871
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Hefnawy MM, Sultan MA, Al-Johar HI, Kassem MG, Aboul-Enein HY.Hefnawy MM, et al. Among authors: sultan ma.Drug Test Anal. 2012 Jan;4(1):39-47. doi: 10.1002/dta.260. Epub 2011 Mar 18.Drug Test Anal. 2012.PMID: 21416633
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Darwish IA, Sultan MA, Al-Arfaj HA.Darwish IA, et al. Among authors: sultan ma.Talanta. 2009 Jun 15;78(4-5):1383-8. doi: 10.1016/j.talanta.2009.02.027. Epub 2009 Feb 23.Talanta. 2009.PMID: 19362205