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Elsayed SA, Alolayan AB, Alahmadi A, Kassim S.Elsayed SA, et al. Among authors: kassim s.Saudi Dent J. 2019 Apr;31(2):212-218. doi: 10.1016/j.sdentj.2018.11.002. Epub 2018 Nov 9.Saudi Dent J. 2019.PMID: 30983831Free PMC article.