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Cho H, Yang DW, Shon YM, Kim BS, Kim YI, Choi YB, Lee KS, Shim YS, Yoon B, Kim W, Ahn KJ.Cho H, et al. Among authors: yang dw.J Korean Med Sci. 2008 Jun;23(3):477-83. doi: 10.3346/jkms.2008.23.3.477.J Korean Med Sci. 2008.PMID: 18583886Free PMC article.Clinical Trial.