1. Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, New York;
2. Institut National de la Santé et de la Recherche Médicale, Unité Mixte de Recherche S707, and Universite Pierre et Marie Curie–Paris 6, Paris, France;
3. Ecole des Hautes Etudes en Sante Publique, Paris et Rennes, Paris, France;
4. Unit of Periodontology, Department of Restorative Dentistry, Periodontology and Endodontology, Ernst-Moritz-Arndt-University Greifswald, Greifswald, Germany;
5. Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, Minnesota, and the Department of Nutrition, University of Oslo, Oslo, Norway;
6. Institute for Clinical Chemistry and Laboratory Medicine, University of Greifswald, Greifswald, Germany;
7. Institute for Community Medicine, University of Greifswald, Greifswald, Germany.