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Lee JH, Oh YJ, Shim YH, Hong YW, Yi G, Kwak YL.Lee JH, et al. Among authors: kwak yl.J Korean Med Sci. 2006 Oct;21(5):854-8. doi: 10.3346/jkms.2006.21.5.854.J Korean Med Sci. 2006.PMID: 17043419Free PMC article.Clinical Trial.