Maintenance work on the ZORA databases is scheduled for Wednesday 22 May 2019 from 20:00-22:00. During this period ZORA and JDB will not be available. Thank you for your understanding.
Schätzle, M; Faddy, M J; Cullinan, M P; Seymour, G J; Lang, N P; Bürgin, W; Änerud, Ä; Boysen, H; Löe, H (2009). The clinical course of chronic periodontitis: V. Predictive factors in periodontal disease. Journal of Clinical Periodontology, 36(5):365-371.