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Duong, Ho-Yan; Schmid, Eric; Ramseier, Christoph A; Suvan, Jean E; Lang-Hua, Bich Hue; Burkhardt, Rino; Schätzle, Marc; Lang, Niklaus P (2022). Periodontal disease progression in the second half of life and following a single episode of scaling and root planing-A clinical study in the Sri Lankan tea plantation cohort with documented clinical parameters over more than 40 years. Journal of periodontology, 93(1), pp. 45-56. Wiley 10.1002/JPER.20-0480