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Kwak HS, Kang YS, Han KO, Moon JT, Chung YC, Choi JS, Han JY, Kim MY, Velázquez-Armenta EY, Nava-Ocampo AA.Kwak HS, et al. Among authors: velazquez armenta ey.J Chromatogr B Analyt Technol Biomed Life Sci. 2010 Jul 1;878(21):1871-4. doi: 10.1016/j.jchromb.2010.05.001. Epub 2010 May 9.J Chromatogr B Analyt Technol Biomed Life Sci. 2010.PMID: 20605750