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Grant MM, Brock GR, Matthews JB, Chapple IL.Grant MM, et al. Among authors: brock gr.J Clin Periodontol. 2010 Jan;37(1):17-23. doi: 10.1111/j.1600-051X.2009.01504.x. Epub 2009 Nov 24.J Clin Periodontol. 2010.PMID: 19968740