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Ryu YJ, Yoo SH, Jung MJ, Jang S, Cho KJ.Ryu YJ, et al.J Korean Med Sci. 2013 Mar;28(3):476-9. doi: 10.3346/jkms.2013.28.3.476. Epub 2013 Mar 4.J Korean Med Sci. 2013.PMID: 23487585Free PMC article.
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