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31. The role of bleeding upon probing in the diagnosis of periodontal disease. A literature review. Greenstein G. J Periodontol; 1984 Dec; 55(12):684-8. PubMed ID: 6394735 [Abstract] [Full Text] [Related]
35. Current status of indices of gingivitis. Ciancio SG. J Clin Periodontol; 1986 May; 13(5):375-8, 381-2. PubMed ID: 3522646 [Abstract] [Full Text] [Related]