Savage, Amir; Eaton, Kenneth A.; Moles, David R.; Needleman, Ian (2009). «A systematic review of definitions of periodontitis and methods that have been used to identify this disease». Journal of Clinical Periodontology. 36 (6): 458–467. PMID19508246. doi:10.1111/j.1600-051X.2009.01408.x
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Savage, Amir; Eaton, Kenneth A.; Moles, David R.; Needleman, Ian (2009). «A systematic review of definitions of periodontitis and methods that have been used to identify this disease». Journal of Clinical Periodontology. 36 (6): 458–467. PMID19508246. doi:10.1111/j.1600-051X.2009.01408.x