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Holtfreter, Birte, Ryan T. Demmer, Olaf Bernhardt, Panos N. Papapanou, Christian Schwahn, Thomas Kocher, and Moise Desvarieux. A Comparison of Periodontal Status in the Two Regional, Population-based Studies of SHIP and INVEST. 2012.

Holtfreter, Birte, et al. A Comparison of Periodontal Status in the Two Regional, Population-based Studies of SHIP and INVEST. 2012.