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Palmer RM, Cortellini P; Group B of European Workshop on Periodontology.Palmer RM, et al.J Clin Periodontol. 2008 Sep;35(8 Suppl):83-6. doi: 10.1111/j.1600-051X.2008.01262.x.J Clin Periodontol. 2008.PMID: 18724843