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Division of Periodontics, Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, SP, Brazil [Correction added after online publication 13 November 2009: “Division of Periodontics” was
removed from the affiliation of Clovis Mariano Faggion Jr and Marc Schmitter and added to the affiliation of Leandro Chambrone and Valéria Gondim.]
Division of Periodontics, Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, SP, Brazil [Correction added after online publication 13 November 2009: “Division of Periodontics” was
removed from the affiliation of Clovis Mariano Faggion Jr and Marc Schmitter and added to the affiliation of Leandro Chambrone and Valéria Gondim.]