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Lee YJ, Cui DZ, Jeon HR, Chung HJ, Park YJ, Kim OS, Kim YJ.Lee YJ, et al. Among authors: chung hj.J Periodontal Implant Sci. 2012 Jun;42(3):81-7. doi: 10.5051/jpis.2012.42.3.81. Epub 2012 Jun 30.J Periodontal Implant Sci. 2012.PMID: 22803009Free PMC article.