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Song WS, Kim CS, Choi SH, Jhon GJ, Kim HY, Cho KS, Kim CK, Chai JK.Song WS, et al. Among authors: chai jk.J Periodontol. 2005 Jan;76(1):22-33. doi: 10.1902/jop.2005.76.1.22.J Periodontol. 2005.PMID: 15830634