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Kiyak HA, Persson RE, Persson GR.Kiyak HA, et al.Periodontol 2000. 1998 Feb;16:34-43. doi: 10.1111/j.1600-0757.1998.tb00114.x.Periodontol 2000. 1998.PMID: 10337303Review.No abstract available.