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Swoboda, Jessica R; Kiyak, H Asuman; Darveau, Richard; Persson, G Rutger (2008). Correlates of periodontal decline and biologic markers in older adults. Journal of periodontology, 79(10), pp. 1920-6. Chicago, Ill.: American Academy of Periodontology 10.1902/jop.2008.080005