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Kopperud SE, Espelid I, Tveit AB, Skudutyte-Rysstad R.Kopperud SE, et al.J Dent. 2015 Nov;43(11):1323-9. doi: 10.1016/j.jdent.2015.08.013. Epub 2015 Aug 30.J Dent. 2015.PMID: 26327559