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Montevecchi M, Checchi V, Gatto MR, Klein S, Checchi L.Montevecchi M, et al.Open Dent J. 2012;6:46-50. doi: 10.2174/1874210601206010046. Epub 2012 Feb 6.Open Dent J. 2012.PMID: 22371815Free PMC article.