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Johanson M, Zhao XR, Huynh-Ba G, Villar CC.Johanson M, et al.J Periodontol. 2013 May;84(5):634-40. doi: 10.1902/jop.2012.120224. Epub 2012 Aug 30.J Periodontol. 2013.PMID: 22934840