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Hou LT, Liu CM, Liu BY, Chang PC, Chen MH, Ho MH, Jehng SM, Liu HC.Hou LT, et al. Among authors: chang pc.J Periodontol. 2007 Feb;78(2):335-43. doi: 10.1902/jop.2007.060106.J Periodontol. 2007.PMID: 17274724