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Song YW, Kim S, Waller T, Cha JK, Cho SW, Jung UW, Thoma DS.Song YW, et al. Among authors: waller t.J Clin Periodontol. 2019 Jan;46(1):96-104. doi: 10.1111/jcpe.13034. Epub 2018 Nov 29.J Clin Periodontol. 2019.PMID: 30372547