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Timonen P, Suominen-Taipale L, Jula A, Niskanen M, Knuuttila M, Ylöstalo P.Timonen P, et al. Among authors: suominen taipale l.J Clin Periodontol. 2011 Jan;38(1):17-24. doi: 10.1111/j.1600-051X.2010.01642.x. Epub 2010 Nov 10.J Clin Periodontol. 2011.PMID: 21070326