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Lang NP, Berglundh T; Working Group 4 of Seventh European Workshop on Periodontology.Lang NP, et al.J Clin Periodontol. 2011 Mar;38 Suppl 11:178-81. doi: 10.1111/j.1600-051X.2010.01674.x.J Clin Periodontol. 2011.PMID: 21323713