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Sung EH, Kim SJ, Chun YS, Park YC, Yu HS, Lee KJ.Sung EH, et al. Among authors: yu hs.Korean J Orthod. 2015 Jan;45(1):20-8. doi: 10.4041/kjod.2015.45.1.20. Epub 2015 Jan 26.Korean J Orthod. 2015.PMID: 25667914Free PMC article.